A.H.
If you have a credit card, add her on as a card holder. Most places will let you put a specific limit on her card, like $500 or $1000. First time it gets abused, it gets taken away. My dad did that for me when I was in college and really helped my credit. It showed that I had an account in good standing since 86, even though I was born in 83. That's why I still have a card linked to his account even though I don't use it. My younger sister is in college and he's doing the same thing for her. It's also good in case of emergency.