Like everyone else who has responded, I have no idea, BUT if she brought you the kit and that includes everything you need to make the top except thread & machine needle(s), could you charge her by the hour ($$.00????) and keep track of the time you work on it? If that is an option and you and she can both agree on how much $ per hour, that would bring you up to the quilting part, the pricing of which you are already knowledgeable.
That would involve a certain amount of faith, of course, because she wouldn't be standing there clocking you as you work.
Since she bought the kit, as a precaution, it might be wise to get a contract signed ... an agreement that she does not get the finished quilt if she does not want to pay the bill when the quilt is completed.