I'd call her back and tell her you have thought about it and would be happy to give the machine a home AND when she has a top ready to be long armed to send it to you and you will happily do it for her. She very well may have found out it is not HER THING to use the machine and wants it to go to someone who will love it. You could offer to pay for the shipping or arrange to actually get someone to haul it for you.
If it happens you do get it, then make her a wonderful quilt and quilt it and send it to her or better yet, deliver it with a hug.