I'm sorry your Mom is in the stage of life she is - it is a hard one to live through - especially for her near and dear ones.
Have you asked the assisted living place if they have any ideas?
I know you said you didn't want to sell her things - but if you have a charity that is near and dear to you that is NOT interested in sewing things - perhaps you could have a sale to raise funds for that.
By the way - if you do decide to do that - DON'T call it a 'garage sale' - call it a 'fabric opportunity' or 'estate sale' - that way you can ask more for the items - and maybe get it!