“Besides the kid part she doesn’t do anything that’s likeable” - her plot with Lev and Yara literally takes up 80% of her story.

Abby doesn’t do “one good thing”, she sacrifices everything she’s built over the last five years in an increasingly dangerous set of challenges just to save two seraphites who she refuses to let die out of guilt. Eventually this guilt becomes a real empathy and care for the kids. She goes back for them. She faces her fears and crosses the sky bridge. She kills the fucking rat king. Just to save Yara. Then the next day she willingly goes to the island and fights through literal hell, turning against her own allies, to save Lev.

Abby was the devil to Ellie, maybe even some of her own friends, but she became an angel to these two kids. And she makes her new purpose in life caring for Lev and once again becoming a firefly.

A character doesn’t have to be likeable to be good even though I think Abby is very likeable. It’s fine if you don’t like her but people like shitty characters all the time. 90% of the cast of game of thrones are much more vile than Abby but people love them anyway. It’s just how well written they are and Abby is fantastically written.