You do not say whether this person is a quilter who has used a long arm machine before or not. The quilt shop I used to go to that had a long arm machine, would not let anyone use it unless they had taken the course in long arm quilting, then I believe it was about $40-$45/hr. and I'm not sure about the batting and thread. Wouldn't it be much simpler for you to just quilt her quilt for her and charge your standard rate? I've always been hesitant to let anyone borrow or use my sewing machines unless I know they know what they are doing, just my opinion.