Thanks everyone for these great ideas!
I have already asked the person daughter's if her mother would like to get some pictures of my little ones wearing garnement sewn with her beloved Bernina. The daughter had told me that the sewing machine was used by her mother, and later herself and her sister to sew many clothing (prom dresses, first interview suit, etc.) She told me her mother would love to. But I got later the idea of sewing a little something for her too. I don't really now where she is living right now, but her husband is still alive and she was herself in good health. All I know is the house was sold and they were selling also most of the furniture.
So I will make her a nice handmade card, put some pictures of my kids and add a little fabric box/wall hanging/mug rug (can't decide right now, it all seems good idea). She wasn't a quilter, so I think anything "quilty" will be new to her and she may like it.
Thanks a lot again for sharing your ideas!