@Throwaway11112 He only has access to charm person, not dominate person, so she knows she has been hypnotized, but as someone with shitty arcana she can't figure out how it works.
Since it has a limited duration, he bestowed a curse on her that triggers charm (would be homebrew, way too strong) on the removal of the item, so even if she runs away, at some point she naturally has to remove the item, and will probably return or call within the duration of charm person.