I would have done the same thing, even though I would just about give my first born to have a LA. Like I would have the space, anyway. I think you did the right thing, that is a huge purchase to just give away. I know I would feel guilty if someone gave me something that big, even family.
What you can do to drop the hint is ask her to quilt your next quilt. She will likely say she can't do it and repeat her offer of giving it to you.