the most I have heard is 24 hours notice or 48..
not anything like five days.
it is a bit much, I would not pay for five days notice.
I would actually try and talk to the lady, and ask if I paid her the cancellation fee would it go towards rebooking with her as soon as we could make it happen,, I think I would pay on those grounds even for five days notice, assuming she was a reputable lady etc etc.
but if she didn't agree to that, no not going to happen,.
five days is a lot of notice, even for a touring girl, she can either fill out her calendar by then or cancel this leg of her stop.