All that being said, I firmly believe that Maggie needs to get over it. While it may sound insensitive (and probably is), for the sake of good TV, Maggie needs to move past the death of Glenn and, namely, her blind hatred for Negan. The Walking Dead has frequently been criticized for falling into repetitive cycles, and Maggie's obsession is now one of them, becoming detrimental to both the show's storytelling and her own characterization.
'The Walking Dead: Dead City' Was Built on Maggie's Hate for Negan
Maggie carried the burden of this vengeance for five seasons in the flagship show, but with the immense cast and Cohan's Season 9 hiatus, the impact of this need for vengeance didn't land as hard in Dead City. It worked well at the beginning of Season 1, where the concept of enemies forced to go on the road together was an appealing one, especially if Negan was involved. Maggie's all-consuming hatred was integral to the show's premise and marketing, and while I thank her for it, I also expected some kind of growth by the end of the season. Usually it is the enemies-to-something arc -- Dead City just becomes stagnant.

Maggie's Blind Hatred Feeds Into 'The Walking Dead' Fatal Flaw
Maggie's tireless hatred is also feeding into The Walking Dead's fatal flaw of being repetitive, something that the new slew of spin-offs was beginning to clean up. The Walking Dead: Daryl Dixon made the most obvious attempt at being fresh by moving to an entirely new, overseas location with an entirely new cast around the titular character. Dead City seemingly tried to achieve this too by introducing us to the jaw-dropping scenes of an overrun Manhattan, giving us skyscrapers and recognizable skylines again after years of hanging around post-apocalyptic communities, as well as the intriguing concept of walker-produced methane as an energy source. But the overwhelmingly familiar emotions radiating off Maggie started digging a little rut for the spin-off.
Maggie Needs To Move on in 'The Walking Dead: Dead City'
Her status as a mother figure, however, provides a little bit of nuance. In Dead City, this was manifested in her single-minded goal to rescue Hershel, but it can also be translated into her leadership style. Just as she is fiercely protective of her son, she has always been a committed leader, particularly in the Season 2 premiere where she offers herself up for conscription to the New Babylon army to save the residents of Bricks from the same fate. While interesting, it still means Maggie generally oscillates between her two roles, one of which is purely defined by her past, leaving me begging for some sort of character development.
In The Walking Dead, she somewhat branched off from these one-note qualities when she left the main group to learn more about building communities, trading, architecture, and so much more with Georgie (Jayne Atkinson), the traveling knowledge-trader. Granted, Maggie was still running away from being around Negan, but at least she was simultaneously running toward something, until she took a giant leap back in this spin-off. I can only hope that Hershel's attempts at forcing Maggie to self-reflect will come to fruition, because, as one of my (and many others) favorite characters in the early seasons, I desperately need to enjoy watching her again.
New episodes of The Walking Dead: Dead City premiere on AMC+ on Sundays in the U.S.