T.F.
Sometimes they will do that. I would begin to worry if she just doesn't eat anything at all and not gaining weight and getting sick. My son one time would only want peanut butter and jelly sandwiches for one week straight and hotdogs and corndogs on other weeks. I'm sure that this is a phase. I would just keep offering her the choices of fruits and veggies and all the sorts of foods you would normally offer. She will eat what she needs. I hope that this helps. Good luck and be patient.