She would be fine with a 64MB video card... even a 32MB one would be fine... though, you would be hard pressed to find any new computer with one that small these days.

What will make the biggest difference is the amount of System RAM she has.
I would suggest at least 2GB, though if she is going to school for design 4GB might be better.
Just get whatever the base model has, then purchase the RAM after the sale and install it yourself.