It appears that my 4.5yo has some issues with anxiety. She started biting her finger nails about 4 months ago, but I didn't think too much of it. We were in the middle of moving and I figured it would settle down. We've been in the new house over 2 months now and she hasn't stopped. We only moved 45 minutes, so not a huge deal. I'm trying to figure out how I can help her get over whatever might be bothering her.

A little background... she's a very bright kid reading, writing, and doing math work well beyond her age. We work on "school" things at home together but only when she's interested in it. I am home with her and her 2.5yo brother. She does gymnastics, attends story hour at the library, and takes swim lessons. We also go to museums and other fun places when everyone seems relaxed enough but always be sure to have at least 1 day where we don't get in the car.

Are there any foods I should try eliminating or adding? Her diet is pretty good and she'll try anything once.