Im gonna shit on your self hosting journey here for a bit. I’m sorry.

There is a reason sick people are in a location where people are close by to be able to react fast if shit hits the fan. What are you gonna do when you see your cat not moving at her favorite spot for too long? When are you gonna be sure she needs help? Then you call someone close by that needs 20 min to get there? And then another 30 to get to a vet? Does someone have a key to you apartment? Are they authorized to spend whatever at the vet?

Keep your ass at home and save the money until your cat is healthy again. Or give her into care so she is safe and not alone like any social animal like cats should not be for extended periods of time.