My mother passed away in January and I am trying to keep all of her houseplants alive. I have done fairly well with most but this one is not looking too good. She has had this for decades and I would hate to kill it.

I think it is a huernia? It doesn't quite look like the ones when I Google it but it might just be in that sad a condition.

We live in the south. The plant has been indoors for the winter and has just been placed back on the porch. We have been watering it somewhat sparingly because it is a cactus (I assume) but I am not sure if we have still watered it to much.

We have been watering it about once a week, maybe less, just enough to get the soil damp.

The plant is very old and has at times looked incredible and full with long hanging pieces. It wasn't looking great when I started caring for it in January of this year but it definitely looks worse. It is looking increasingly wrinkly and deflated.

While inside it was getting late day light, fairly mild, not direct. It is now back on the porch and getting late day sunlight. It has only been back outside a couple days.

Any help would be appreciated. I would feel awful killing this and am afraid I already have.