How do I handle a well-off sister who won’t help pay for mom’s care?

My mom is an elder lady who of course she has her needs. I take care of her with my brother at home. As an elder person of coruse she need things to be well at the house and be away from risks, (special bath rug, and other stuff for her safety at home). Anyway my sister is married and she of course is always concerned about mom safety. My sister lives well not that she is a millionaire but she earns well and her husband much more. They travel often locally and domestically, they always buy new electronic gadgets, they like to hang out socially often with friends, etc.- Anyway in my house we dont have a lot of money so we need to take care of the money we spend, unlike my sister.

Whenever my sister lets say sees something that my mom could need for her safety at house, my sister send me or my brother a photo of the item and tell us to buy it. It happens often, with any gadget she sees she inform us. But guess what? She wants us to buy the item but she never collaborates and buys it herself for mom, my brother and I are the ones who need to buy the stuff , she just inform us. I dont think taht is fair. she is also mom`s daughter but she can't buy the thing herself, it has to be my brother and I, the ones who do not earn that much money and my mom pension is not so much either. Each time is like that with my sister. She find something on the web or at a store and tell us about it and tell us to buy it. But on her own will, she never does it. It is so easy to just let us know but not cooperate one bit? And then she complains that we haven't bought the thing when we have to buy it.

How do I handle a well-off sister who won’t help pay for mom’s care?
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