[Suze65]

I'm so sorry, but as has been said don't blame your self. It is still very difficult, even for specialist vets to diagnose tortoises, because they live in a box ( the shell ) and as CB said , I have also seen many people come on here and say, their tortoise seemed fine one day, ill the next and dead the next. Tortoise are incredibly good at hiding their illness until they are too far gone to help. And as Terry said, this may have started months before. When they are this small they can still dehydrate over night, and in captivity they do bask more than they would in the wild and so are more likely to dehydrate. If she had a bladder stone, it could have been growing for months, and when they are this small , there isn't much you can do about it. So you really mustn't blame you're self. So sorry 😔