Having worked in optical for about 8 years, if she just needs glasses and is having no "major" vision problems, I suggest staying with an optometrist. They prescribe glasses every day and will give you a much better exam for glasses than an ophthalmologist. ophthalmologist deal with the big issues and are trying to get kids to see at all and don't do as well with the small things like glasses prescriptions.
Dr Mary Beth Hall in Carrollton (Primary Eye Care) does great with kids. She has kids of her own, though they are getting big now, and really appreciates the time she gets to spend with her smaller patients.