It does look very labor intensive, cost is up to an individual, but the least I would charge would be $20.00 per hour and to give her an estimate I would over estimate, final price can always be less than the quote.
As she has provided the kit, I would guess that should be all the needed fabric for the top, include a clause that if the fabric is short (as it can be) you will need to add that cost and your time in finding and purchasing the fabric.
Good luck, it is a beautiful quilt pattern and look forward to seeing your progress on it.