I didn't read the spoiler that much, only until her regression. But I think she never mean to help MC. She just think she is. Like keeping her close as if that would make MC happy, thinking that MC's life got spared because of her. As if she just doing a favor to the MC.
o_o I think it's because she wanted her to focus on her only, but seeing that she can get everyone around her to like her, a small seed of jealousy rooted in the Princess. I saw in a spoiler how dark her jealousy grows. So you'll want to keep hating this little princess. = ,= Let's just say she had childish reasons for saving our FL.
I'm fucking confuse?? like the princess also regress and trying to help the MC. but her actions seems dumb. Like why didn't she help when she was in a crate. why didn't she ask her father to look for her.
I can already predicts that she's was doing it for the sake of MC.