omg dragon world that’s so cool i wonder y aileen is the only dragon in the tower

it was explained. I don't remember which chapter but the dragons said the reason why Aileen is in the tower.

ooo yah i do recall smt like that!! do u remember what the reason was? was it just bc she is sick?

I checked now and it's chapter 29. She is at the tower to get stronger because she is sick.