I also think someone's feelings are going to get hurt. Simple quilting is about $0.01 in my area, so the quilting by a long armer would only come to about $25, although they probably have a minimum. I guess I would start by telling her that you kept track of your time and it was about 40 hours of work. Without seeing the quilt, I think I would ask for $200.
Is this the same quilt you asked for pricing suggestions in October?
You also have to promise us that you will never take on a another project for someone without coming up with an estimate, in writing, before you start!