A spoiler after the final battle
Spoiler!
After the final battle and after losing her memories, Astier avoided almost everyone except his dad. Agavert would always visit her in the Palace but she was really uncomfortable. When Selina visited her, she's okay with her and even told her that she's really scared of Lucarion & mercenaries (especially Agavert). She said she thought Lucarion is a ghost because others pretended not to see him(he was lurking around Tie, not approaching her but Astier can sense him). Agavert & Ardiana is listening throughout their conversation outside because they wanted to know her true feelings. (This is 6 months after the battle)
So the gang who heard everything, interpreted it as Tie becoming an ordinary kid who, since losing her crucial memories, she now only remembers the feelings of fear she felt back then. And sadly, Astier kept those feelings hidden from the adults. They realized belatedly that during all those times they were facing/killing monsters, she said she's okay because she didn't want them to worry about her. They understood but of course they are hurt that they can't approach her now, at the same time they are sad that they are now learning that Tie hid her fear well and realizes again that she's just a 4yo child and they made her shoulder such heavy role before. Ofc, no matter what she said, it was not okay for a child to fight. So since they concluded that Tie's reaction is because of what her body remembers while she forgot the memories, they decided to not approach Tie anymore (because seeing them will trigger deeep hidden trauma). Agavert decided to disband.
I like to post spoilers for the stories I find interesting because I don't have much time to read novel due to busy schedule
you will find me in most romantic historical manhwa comment sections 
you will find me in most romantic historical manhwa comment sections 
