Ballet is great for posture so your daughter will benefit from it. I personally use Element Ballet Conditioning Work out DVD
http://amzn.com/B000WC38BO at home along with Pilates DVD's. Maybe your daughter will like to join you while u play a dvd at home?
Also, I'm very picky on the height of pillows, as I feel it will misalign neck/back posture if it is too high. So I'm still doing research on the best pillow for my 3 yr old son and for ourselves. I think we're going to buy 100% silk pillow case coverings and possibly wool filled pillows, not sure yet.
Ethan will be enrolled in Karate, Dance, Sports soon so that will help with his cordination/posture/agility.