I am in the US, in NC. Maggie, like most rats, had a respiratory disease. It didn't help that not only was she inbreed, but she was also a lab rat at a cosmetic testing facility. She had no other illnesses. Maggie was humanely pet down at the vet's because she was suffering. Cora has a clean bill of health, thankfully she doesn't have any respiratory issues, but I still have her go to the vet regularly for check ups.
I really want to get another rat or rats, but I'm not ready and going to school so I feel like I won't have enough time to be around Cora and a new rat(s). Especially since I always do a quarantine with my new rats for about a week or two.
Side note: I actually bought two albino rat stuffed animals that look exactly like Mags. One for me and one for Cora (I took off the eye beads so she doesn't chew them off and swallow them). She cuddles with it in her hanging bed as if it's Maggie, I even saw her cleaning it like she did Maggie.
Thanks for everyone