Thanks everyone for all of the great advice. I've decided I definately won't charge the $7/hour. I didn't realize how much that would actually be a week, & for where she will be working, it would be too much. I'm going to work on writing out a contract. I don't know if she would take advantage of me or not.
She'll be working the same place Shane does, only she'll be under a different contractor. If she's part time, she'll work 6 hours shifts (or 12 if she wants) & she'll get to pick the days & times. Here are the "blocks" that she could work..
A Block - 7:30am - 1:30pm
B Block - 1:30pm - 7:30pm
C Block - 7:30pm - 1:30am
D Block - 1:30 am - 7:30am
With part time though, she wouldn't only have to do 6 hours shifts.. She could combine 2 blocks to do 12.
If she goes full time she'll be on rotating teams just like Shane does. It'd be 2 days on days, 2 days off, 3 days on nights, 2 days off, etc. The hours would be 7-7. It works out to be 3 days one week & 4 days the next.
If I was the one doing the 6 hour shifts I would be comfortable paying $25/day, so that is what I will charge for that. I'm still stumped on if she does 12 hour shifts on the rotating teams though. At $25/day for 6 hours it comes out to about $4/hour. If I keep it at $4/hour, it'd be $50 for 12 hours. Is that way too high?