St Benedict/St John’s University’s is Catholic in name only. I have a friend who goes there and she has told me what a disappointing experience it has been for her.
Benedictine College has an art program and it is actually is a Catholic school.
benedictine.edu/students.asp?pgID=569 This would be your best bet!

I think you should really look into this one. If she wants both art and faith then this is where she should look.
I do not know anything about Viterbo University, and since I have not heard of it I would question it. I would really suggest doing some intense searches to see if you can find anything questionable before taking interest in it.
There is really only a handful of schools in the States that are truly known for their truly Catholic identity. Benedictine is one of about seven or eight.
If she does not like Benedictine then I would suggest she just go to a public university with a great art program and a really awesome Catholic center. She would get what she wants doing that more so then going to a Catholic University that is Catholic in name only and with an all right and passable art program.
Attending a school that you believe to be Catholic and that is really not can be a really heartbreaking and stressful experience.
I’ll remember her in prayer! God bless you both!
In Jesus and Mary,
Marie