Think of it like becoming an orphan after having a wonderful family that unexpectedly died and having an equally loving and wonderful Foster family. I still doubt that within the first few months you're not gonna feel some resentment and grief, you're not thinking about accepting them because you're still holding onto how it was before.
Every fiction has a different set of rules when it come to magic, its origin, how its used whether with spells, potions, will power etc, until she learns this world's set of rules of magic she won't stop, but then again denial will probably mean she won't stop anyway, I just like that this manwha doesn't gloss over the loss part cos I forgot how sad it actually would be.
I won't go super in to detail, just the titles: shock, denial, anger, bargaining, depression, testing, acceptance, the amount of stages vary depending on what source its from but its clear to me that that's what she's experiencing.
I actually think there's supposed to be five stages, shock and testing are just ones somebody other than the original theorist added.
I love how everybody acting like she's not going through the stages of grieving her family. I'm sorry that it wouldn't take you a long time to come term's with NEVER seeing your family again. I mean yeah her new family are wonderful, but it's not like it weren't unexpected as fuck, with the way she died and magic being present I don't expect her to just get over it even after seven months. Really think about it guys, would you?