It depends on how old your mom is, but you could start with the local nursing homes.

Split the thing apart and clean the grease out of it... throughly. Once cleaned the buttons will work again. Ask me how I know.

There is some on Amazon and also at ftatronix and at dreamlink store all 25 bucks or the dreamlink remote for 20 it works on formulers too. https://dreamlinkstore.com/products/formuler-z7-dreamlink-t1-plus-t2-smart-programmable-learning-remote

For mom or remote? Dont get an American mom. They do it too.

I use a Harmony 650 on my Formuler

You can’t replace yo momma

I've seen a tonne of DIY's for fixing this kind of problem. I believe most of the issues can be fixed by cleaning as someone else has mentioned, or by adding more conductive materials to the circuit board to ensure a better connection when the button is pressed.

Here's one I quickly googled: https://www.instructables.com/id/Fixing-Non-Working-Buttons-of-Any-Remote-Control/

But I also remember seeing a guide where someone used a metallic paste of some kind to make the circuit board conductive again. Maybe too much work but this remote looks like it's got some unique buttons that may be worth saving.

Good luck!

Literally any universal remote

https://dreamlinkmedia.tech/product/formuler-z-7-plus-learning-remote-control-replacement/