Mug rug or placemats.
Welcome to the Quilting Board!
I would be very leary of making something for someone I do not know. Some do not like craft type things. This board alone has many heartbreaking stories of quilts and such given and the maker being hurt because the reciever did not appreciated what went into the gift . I know many young people I work with that have laughed at gifts their grandmas have given them for christmas ect.
You can sew up a few bags and add rice to them. They can be microwaved for heat or in the freezer for cold. That's what I would do...or just give her a gift card to Bath and Body!