My Mom (89) can climb over the baby gate. Is there a device I can use on the gate to alert me?

Screen door with the latch way up high where she can't unhook it.

How about installing a door with a lock? Why does she want to go there anyhow? I first thought of maybe a curtain on a tension rod to block the view, but a door is probably better.

The upstairs is the main part of the house. Downstairs is the laundry room, storage and such. She has fallen down the stairs in the past which is why the gate was originally installed. She just started this after seeing her teenaged great grand daughter climb over it.

My dad will stop if he sees a gate.. my tension gate will not work for someone determined ...

There are taller gates that have doors you can put on staircases. I have one separating my two rooms right now to keep the rabbits apart -- they fight. The gate is 4' tall, so no one is going to be climbing it. It can be screwed into the wall for support. There is one way she could still get by if she figured out how to loosen the bolts. You could lock the gate at night to keep her from going through it easily. I do have to warn, however, that where there's a will, there's a way. No people or pet indoor gate will be secure against strong force.

OMG, take the baby gate down.

Assuming she's coming out of her room. Give her a door mat with an alarm at the doorway to her room, and/or a seat alarm, and/or a bed alarm. This is SUCH a disaster waiting to happen.

Our baby gate is tension based.. we can move it higher if needed. Maybe waist high will work?

Set up her living space downstairs. If she's sleeping down there maybe she won't need to go back up.

Why do you have a gate at the top of the stairs? Are you afraid she'll fall? You can't reason with people with dementia. She needs an actual person there who will stop her. Or a facility. I'm curious, what is the reason for keeping her upstairs?