She wants to play.
Dolly backpack is a Epic Fortnite BackBling. Is Part of the Final Reckoning set.
This backbling was added at Fortnite Battle Royale on 24 October 2019 (Chapter 2 Season 1 Patch 11.00).
The Set Final Reckoning contains 25 cosmetic items.
The back bling Dolly belongs to Chapter 2 Season 1. It's not yet known how to get the cosmetic Dolly.