- "So, if you don't remember, I'm Bertie. And I owe my life to you all, twice over. A bunch of us do. Enid says that you want Gregory to get us to fight the Saviors with you. Is that true? (...) Do you think we can win, that we really could beat them? Us? (...) Well, Enid says you could show us the way. I'm ready."
- —Bertie to Maggie about fighting the Saviors.[src]
Nothing is known about Bertie's life prior to or as the outbreak began.
Bertie became a resident of the Hilltop Colony at an undisclosed point before this episode. She traveled on a supply run with Freddie, Carson and Wesley to scavenge supplies, most importantly medical supplies. Their car crashed on the way due to Walkers, and the four hid inside a nearby house from the dead. She and Wesley were subsequently rescued when Rick and his group arrived to rescue her group on behalf of Jesus, after-which she alerted her rescuers to the fact that two of her members were still in the building, one of them being hurt. She joined the group in the RV on the ride back to Hilltop and entered with the group once they got there. She is later seen cleaning her boots as she sits on a set of steps when Dr. Carson approaches her.
Bertie is among the Hilltop townspeople to gather in front of the Barrington House and pledge allegiance to Rick and his crew, thanks to the recent efforts of Maggie and Sasha, who saved the town from a zombie attack that was started by the Saviors.
Bertie is seen with Wesley, Freddie, Eduardo, and other Hilltop members training in hand to hand combat with Maggie, Sasha, and Enid. Later, Bertie is outside with Freddie as the Saviors take Dr. Carson away to the Sanctuary.
Bertie arrives with Maggie and the Hilltop fighters just in time to join the fight agaisnt Negan and the Saviors. She yells orders to the fighters as Negan notices Maggie is alive and well.
Bertie is present as Rick, Maggie and Ezekiel stand on a podium and address the crowd as the leaders of their respective communities: Alexandria, the Hilltop and the Kingdom, united and ready for war. She listens with a focused look of determination on her face as the leaders speak.
This list shows the victims Bertie has killed:
- Possibly numerous counts of zombies.
- The actress stated that Bertie is possibly the TV counterpart of Brianna from the comic series.