Obviously, that relationship won’t be shown in Season 9 of The Walking Dead, and with the news already out there that Rick will not clash with Alpha, Lydia’s story could look a lot different when viewers see her in The Walking Dead.
Lydia plays a few roles in the Whisperer’s arc in The Walking Dead comics, although as THR pointed out a lot of it is intertwined in a romantic relationship with Carl Grimes.
That said, it’s not completely out of the question that the show doesn’t play out at least one spoiler-ish part of Lydia’s character arc, which would mean her character could mean a lot more to the series in future seasons.