How can I ask her this, without sounding mean?

Horror_lover92
So it's this girl at my job I believe she's 18 or 19, when I first met her she seemed really sweet and I thought she could be a good work friend, but she showed this ugly side of her when I started talking to this guy so I assumed maybe she had a crush on him and was mad that he was showing interest in me and not her. So months go by after he quit, she goes back to being nice to me, but now I just don't understand what's going on, she now stares at me a lot, everytime I'm alone she's suddenly there, always touching me, one day we had a group meeting and we were laughing at our manager jokes and she looked directly at me laughing like trying to meet eye contact with me, also she keeps asking if something looks cute on her or taking my santa hat and putting it on her and asking how she looks.
I also may add before this sudden change she has been doing.. she would spread some rumors, I didn't confront her because I'm to old for petty drama plus I'm just too old to confront someone that is a teenager and I'm clearly almost 30.
How can I ask her this, without sounding mean?
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