She is in your camp, as all companions say when you already have 4 characters in the party.
If Laezel was not freed from the cage at all, she will meet at the "Git Patrol" event, in the event that you will not save people from the burning house, but go there immediately. She will be level 1 ... very uncomfortable in a fight



Thanks to Larian for Baldurs Gate 3 and the reaction to player feedback