The Girl I like giving me mixed signals which I've never seen like that before?

tough_guy
We are coworkers in a private company. We knew each other more than a year. I'm 25 years old heavyweight free-style wrestler and UI Graphist. I have an athletic body and sporty character, but so intellectual and spiritual person. She's 21 average looking girl (but Prettiest one for me) from a middle class family. She's flirtious and kind. based on what others said I'm much better than this girl in every terms. Despite of her I'm not too talkative person and more serious but humorous person. I just tried to give realistic information.

We started very good with eachother, but she giving mixed signals to me, was very friendly in person but formal in chat! I did some technical work for her on workplace and she thanking so much of me everytime. but next time was cold and again friendly! or flirt with other dumb guys around.
I crushed with her actions n decided to Ignore her (not any harsh act just didn't talk her and pay attention at all).
Finally Ignored her completely for 2 months.
After 2 months she tried to talk me but I was cold as hell and formal. next day again tried, call my first name and said "Are you sad at me?" I said no. then said "Sorry If I did anything wrong with you which I didn't notice". after that day she tried to talk with me every time met me. I was still cold. then One day she sat besides me on work n started talking for more than a hour! talk random topics like my birthday date? my fav cafe? and... at last she said take care of yourself!
After a month of cold behaviour, I became warm again and we friendly again. I decided to move forward. One day on one of our conv about theater I said one of my friend had a theater show and If you want you can join me up to going for her theater probably next week. She answered " Actually I'm to busy in these days (she was right because she's in university an work same time like me) and If I have free time I like to go theater, But I''ll let you know"!

Just tell me what's in her mind? Does she like me or not?
Updates:
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Update: I did keep things professional. I acted with her like a gentleman always and wasn't needy at all. but with care about herself in detail and small things tried to show my interest.

Update 2: She flirts with other guys. She is very close to the guy who sit side me. Flirt him a lot. I'm the most experienced guy in the work and everything a guy should know in the workplace! All of the other guys she flirt them are ones who train and consultant under me for their gym plans and datings!
+1 y
Important: After we became friendly again before ask her out I created instagram for the first time and as I didn't knw much about dat ask some questions about from her, then ask for her insta, she said me eager word by word her id to sure I dont follow wrong person then I requested her. She Didn't accept nor reject my request till next week I ask her out. I treat like I didn't even checked and she was still very nice in person. After that till today my request is still pending while she is active
The Girl I like giving me mixed signals which I've never seen like that before?
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