Card recommendation for elderly person

I'm looking for a card that I can digitally put money on that, if it gets hacked or some sort of fraud occurs, they can only take the small amount that's on it currently and I can just trash it. I've got an elderly family member I manage finances for and she is constantly clicking on crap on her phone or iPad and getting fraud charges. It's become a quarterly problem. I always get the bank or credit card company to reverse the charge and issue a new card, but it's become a hassle and I'd rather just have a card I can put small amounts on whenever, and if it happens again I can just eat it and move on with life. I thought about cash app or venmo, but I don't know anything about those services. If those get hacked, or goes negative due to fraud, if that's even possible, can I just tear the card up and bounce, or will they come after the bank account that's attached to the card that I'd use to load money on it from time to time? We're only talking like 2 or $300/month. I'm not looking to use it to pay for legit services like utility bills. I think she keeps buying trinkets from obscure websites and her info is getting sent to fraud land, but I'm not even sure what exactly it is at this point. She never knows what exactly caused it.

I'm not trying to be a deadbeat, I'm just tired of trying to explain to this person that she can't click on every link she gets from India. She's the type that'll get an email or text saying her netflix account is shut down if she doesn't update her payment, when in reality she's on my netflix account and she doesn't even pay it, nor is her email or phone number associated with the account.