You need to Hang out more till she leaves you alone at her Apartment.
Check her Bedside should be a Torture Rack Card, Continue from there!
Required to have 1.5k Bits go get them Soldier!
When you are trying to Refurbish the Milk Sucking barn from time to time Bell, would wander off.
She has a Scene if you find her in Transylvania, and The Forest, just find her in the Jail at New Ark, if both locations fail to Piece.
Go to the Mall, should find a few stores find the store with the CowGirl tag to get Bell, a CowBell.