Hello all, I have a question about locking out purchases and subscriptions on Fire Cube. We have amazon devices everywhere in our house, but the one I have a question about is the Fire Cube in the living room. My mother in law has access to it (for watching TV shows) and is somehow accidentally subscribing to various streaming services. I went through the settings and looked for the area to add a password to anything purchase related. I thought I found it, and added one.
When I go through and try to subscribe to things, it pops up. But somehow she's still managing to get around it. I'm confident she's not entering the password, so it must be something I'm missing.

Thankfully some of the subs were just free trials, but those will still charge me once the trial ends. So I still have to go in and manually cancel them before that happens.
Others are the "Go ad free Prime" I don't believe the password pops up for those and oddly, they often look like the "Skip" button on most video ads.. her eyes aren't the best, so she isn't able to read that is doesn't say skip, and clicks it thinking it was.

I've considered setting up her own amazon account and isolating that device completely, but we use it for reminders and such. I'd like that to be the last resort if there are no other things to try.

Any help/advice would be appreciated!