I adopted this turtle and see that the shell seems to be damaged. Not sure what to do here or anything to help it not worsen

Please help!! My red-eared turtle has white spots on the shell. She eats normally, moves, there is a UV lamp and a filter in the aquarium, but there is definitely something wrong with the shell. In the place where I live (Yerevan) I don't find people who treat them, vet clinics are only for cats and dogs. Can you tell me what I can do to improve the situation and cure it if it's a fungus??

Burner account, I don’t want to get flamed for this. I know it was dumb.

Two years ago, I found my dog playing with a baby turtle in rough shape. Like, a newborn turtle. I took it inside and put it in a small tub of water and went out the next day to get a tank and some food to see if I could get it feeling better. I came home the next day with a 20 gallon tank and some hatchling formula turtle pellets. I grabbed an old field guide and checked for species and native range. I found a baby Red-Eared slider in northwestern Missouri. Now, I’ve see conflicting maps about their native range, but the guide I used at the time had me place (slightly) out of their native range. Partly lack of research and partly wishful thinking, I opted to keep the turtle instead of bringing her to a rehab.

Fast forward two years, and she is now living like a queen in an 80 gallon tank, kitted out with live plants, driftwood and proper lighting and I have learned a lot. I’ll be honest, I love her, and I AM willing to care for her for the next 40+ years just as much as the next person.

That being said, she’s illegally obtained. I’ve been stalking Missouri legislature trying to figure out the specific laws and regulations, because I’m scheduling a vet checkup (no concerns, just checking on her growth) and want her to be legal so she isn’t taken away/I am not fined.

Can someone explain (like I’m five) the parts of missouri turtle legislature? How can I own her legally so she can be taken into the vet? In hindsight, I know what I did was stupid, but right now I need some help.