If she's a hoarder who is trying to dig out, giving the fabric to someone who she thinks will use it is probably the strategy she is using to offload it.
What might work would be to tell her that it's not your style, but you will gladly pass it on to a charity or guild or something where it will be put to good use. If she's hoping to set you up for making a quilt, then she won't continue to give to you. But if she is honestly trying to rehome and declutter, then that may satisfy her criteria. Better yet, you could give her a list of charity quilters or people who accept random fabric, and let her do the giving.
RST