I think you can't go wrong if you give her the quilt in your avatar for the moment.
I'd ask brother to allow you to select some things you might want to use for a memory quilt to be given later - you would know what you're looking for, it's your vision.
And maybe family memories need to be the theme, not just focusing on the mother. If the whole family is in the quilt, it's a reminder about supporting each other along the way.
JMHO