It's worth asking the question as to whether or not she can do mornings as well.

I would ask her to come over and meet your furbaby. Make some general observations as to whether or not you think she can handle him, does he pull too much on walks etc (if you're going to ask her to walk him)? Make sure her parents are aware and are ok with her going around to your place.

Generally, kennels are around $20-$25 a day for large breeds. You're providng the food etc so I think maybe $15 is a reasonable amount to offer per day.

Good luck!