Picky Eater!

Ok, so what happened to my fabulous eater. Peyton who started eating food very early and had no interest in baby food, is now a very picky eater. She would eat anything given to her before. I mean anything. To test this I even gave he some celery at like 9 months and she went to town. BUT this has all changed. She is so hard to feed. If she doesn't think she wants it she will purse her lips together and push it away with her hand. She eats fruit and breakfast stuff well, but other than that she's difficult. She barely eats anything I put in front of her for dinner. The only dinner type things she likes are hotdogs, french fries and green beans. I mean really she is killing me. Please tell me she is going to grow out of this. I'm not cooking anything special for her so some nights she basically just drinks her milk. So frustrating!!!