I mean, she's totally evil though? She's not just evil, granted, but she is still (sometimes pointlessly) cruel, power-hungry, utterly ruthless, and entirely willing to do profoundly monstrous things in the name of her cause. Like, if Mab wasn't evil, we wouldn't need to have an entire Faction sitting in the wings with loaded shotguns watching her 24/7.
Not that she's required to be so for my argument anyway. She just needs to view everyone as just as power-hungry and ruthless as her- which she does.
I mean, just look at her views on Harry's relationship with Molly.
If you want to argue that Harry may come to consider her something other then an enemy, then sure, but we're talking about Mab, not Harry.