I know this is about your mom and not the furniture, but -- if you have a good relationship with your sister, you can just arrange to get the hope chest from her when your mom passes.
If you have a child, please start looking for a nice chest now that can be her (or his!) hope chest growing up, and can be a gift from you when your child is of age. If you are into this kind of symbolism, you can fill it with baby mementos and your hopes for your child's future -- which makes more sense than the original use, nowadays, anyway.