Search Results: meeting a new girl

We hired a new girl on my team who is about 10 years younger than me. From the day I met her she struck me as a deeply unhappy and insecure person. She's constantly talking herself up, implying that she's "exceptional" and talking down to the coworkers who are at her level. She also really kisses up to the male managers, to the point of flirting, and it's very uncomfortable.

The reason why this is affecting me is because I think she sees me as "the competition". In meetings she won't look me in the eye and she basically ignores me like I'm not even there. She never asks my opinion on anything, even though I'm more senior than she is. It's like she's trying to erase my existence.

Why is she doing this?