First don't think of her as family. Realize what they are asking IS a big project. They don't want a low cost car wash they want a rebuilt engine. Just because you have the skill dose NOT mean you have to use it. You have been upfront about the amount of work. Charging per hour is great but give them an "overestimated" hour quote. YOU have to be OK with them NOT wanting it done. They can make the choice to go in another direction. Is this a "hay I know you have skill can you do this for me" OR a " this quilt has significant memories for me and it is important to me that I do what ever I can to preserve it and I'm glad I found someone who can do it for me."