What a lucky tort! I'm not an expert, still learning more about my RT, sweetpea. When you get a chance, measure and weigh her (or him). That will give you a baseline for the vet. Good luck and keep reading. :)
Welcome! Your enclosure sounds great, post pictures while you are building/creating it. I am also tossing around ideas for a new enclosure and will get help in building it. Good Luck ;)
So Sorry to hear about your loss. Unfortunately, I do not know enough myself to give you any advice. I do know that losing a dear pet affects me and finding out the cause will help put closure on it. Good luck.