In past Bachelor/Bachelorette seasons, multiple of the former leads generally come to the Mansion to offer words of wisdom to the newest one during the first episode. While women from the past seasons usually advise the Bachelorettes, and men advise the Bachelors, based on how popular Hannah’s season was, it’s not surprising that she would be brought back to give some advice to her ex.
Because Hannah is appearing during the limo night and not ahead of the season, there is a chance that she will be talking to some of the contestants throughout the night. If this is the case, it would be a first for the show — and it would likely be wildly entertaining.
Of course, there is also the possibility that Hannah is back to be a contestant on the show (which alums Nick Viall and Becca Tilley have both done in the past, and Chris Bukowski attempted to do as well).
Source : https://www.distractify.com/p/hannah-b-on-the-bachelor