It's very hard work. She'll earn every penny. Tip my hat to her spirit...
Good on her for wanting to work, but I've seen several young entrepreneurs try it and they last about two or three planes and throw in the towel. Be prepared for this to be very temporary so don't let her put a lot of $$$$ into it.
It's like cutting firewood for a living. Most landowners will give you all the wood you want if you give them some and clear the land. It looks real good on paper until the sweat start's rolling down your back and you break a chainsaw, or cut yourself, etc.... sorry, not trying to be a Debbie Downer, but that's what I see. We currently have no plane washers on the field.