She just counts as a pet; summon and dismiss some other non-combat pet and she'll disappear. Assuming you're talking about the Innkeeper's Daughter, that is.
We have a guild member with it out for 3 days, keep staying there, its not a pet as i know its one you use like HS. It just dont dissapier again :P , keep following you and that laughing is to go crazy about. I guess its a bug that need to be fixed.