What happened to Caroline?
More precisely what happened until the girl said that she would not be able to use magic anymore. Even the girl felt that her body was slowly losing its magic.
At first, the girl thought that it all happened because she was tired, but all the weirdness continued even though she felt like she had no mana at all. And it turns out that all those negative thoughts get the truth, she can't use some magic and all of them are high-level magic.
But now that Selena knows and Caroline isn't sure, will anything change because she never thought it would be anything good because this all happened for no reason. It was as if she was being brought back, in reality, that magic power was not hers but Livina's.