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Is there a way to overcome this, besides switching jobs or dating other girls? Yep, oneitis sucks.
Usually there isn't and I suspect you already know this to be the case. Generally the ONLY way she will ever gain interest or show interest is for you to go out and lead your life and meet more girls and she sees on the fun she is missing out on.
One time I had a similar situation before I knew about game. Asked a co-worker out, she accepted, and then flaked. I started living life and not giving a fuck around her. Somehow, she ended up asking me out.
The main thing is, the moment you engage more women and broaden the circle of women in your life, this girl will diminish in importance.