wheres Bain? and who is she?

So I was watching someone play payday 3 on youtube and I kept hearing a female voice, at first I thought "oh so that must be a character who guides you through some of the missions like Vlad did in payday 2", but I kept hearing this new characters voice seemingly in every mission, so then I thought "has starbreeze replaced Bain?". So I just need some clarification on who this character is