Female coworker, 59 y.o., married, Gemini sign...is she flirting or being friendly?

[Plutarh]

I am asking myself questions about the meaning of some behaviors and words of a colleague at work.
I am wondering if it is pure conversation and a desire to be frienfly or flirting in the romantic sense or flirting for the sake of flirting?

As a general presentation, it is a 59-year-old woman, married.
In turn, I am married, I am 38 years old, I specify from the very beginning that there is no question of any romantic relationship, either currently or in the past, with the person in question.
I am not pursuing any interest of any kind.

She is the female colleague with who I work on the same tasks, with who I collaborate best for over 7 years. I myself campaigned alongside the manager at the time for her to join our team, knowing that she is a hardworking person.

Below are some situations to give you an idea of her personality (by the way, she is a Gemini):

- when we walk in the hallways or in the yard, if she sees a colleague from a distance, she greets him/her and even waves;
- she talks a lot about any topic and gets into conversations with colleagues from other departments, asks for details, asks questions in parallel fields that she has no competence or connection to and likes to say that she would be good at those fields here too, getting into a lot of trouble;
- she makes repetitive jokes or if she gets fixated on an idea, a phrase, she repeats it for days in a row in various contexts;
- when she worked in another department, she would go to other departments to gather information and do her job, an opportunity she used to criticize some of her colleagues and complain that she didn't get along with them;
- from the departments where she left, she worked in two more places, she kept arguing with her colleagues whom she criticized throughout the building.
- she is not liked or accepted very well by others due to her behaviour.

Now, situations that may or may not be flirting:

In the past, an unmarried colleague, 5 years younger than her, who made rather inappropriate jokes with almost all his female colleagues, had started to address her as a "little kitten". Totally inappropriate in the work environment. She never said anything to him. Moreover, one morning she told him in the hallway that he seemed asleep and he kissed her on the cheek. She didn't say anything, she laughed a little. Very akward situation for the others. Another time, she was talking to him about various things related to the job and joking, and I noticed that they looked into each other's eyes for a long time in silence. Another young female colleague saw that too and asked me after if our player male colleague knows that our female colleague is married (he knew that because she told her).
Another time, without any connection, she told him in the hallway that she was angry with him for not taking her intoaccount, what wasn't true.
This male colleague criticized her behind her back and said she was not good at anything and she always came to him to ask for information to do her job.
Years passed, there was nothing between them, now she barely speaks to him anymore, finding out how he criticized her to other colleagues.

We have a colleague who works in another field, in our office, who is single, has never been married. In addition to the fact that she talks to him a lot and asks him for information about his work, which is not related to her work, she once asked him how old he was and when he said 58 years old she said she thought he was somewhere around 50. This colleague always wears a T-shirt, goes to the gym, has a normal to athletic physique although he does not have prominent biceps. Another colleague, also 60 years old, told her about this colleague that he wears a T-shirt to impress younger colleagues and she commented that she had no concerns about his age.

In various circumstances, the person I am talking about said that she is old in her 59 y.o. age, as if expecting compliments from other colleagues that she looked much younger and so on. The others refrained from commenting.

Sometimes in situations where she upset me with what she said to me, small things related to daily activity, I withdrew and did not talk to her that day, did I not take her into account? Being a Gemini, this annoys her the most and later told me this that I was uppset on her and didn't talk to her...

Reading all of the above, does it seem to you that this is flirting or a desire to communicate and always be the center of attention specific to the Gemini sign?

[Gebidozo]

I find it very strange that you are so concerned with the behavior of a coworker.

She hasn’t been behaving inappropriately with you, has she?

Then why are you so obsessed with her potentially flirty behavior with other men?

Why the weirdly detailed analysis, complete with astrological mumbo-jumbo?

[ExpatInItaly]

4 hours ago, Plutarh said:

does it seem to you that this is flirting or a desire to communicate and always be the center of attention specific to the Gemini sign?

I am a Gemini too and none of what you describe has anything to do with her date of birth. 

She doesn't appear to be flirting with anyone. Why are you so invested in all of their behaviour? It doesn't seem to be connected to you in any way.