I am not so sure, Mab may begin to see Harry as a threat, especially allied with Molly ...
I suspect Mab of having the kind of monomaniacal fanaticism that puts "personal survival" somewhere below her own top-3 priorities. By her lights, any Winterfae who can take her out deserve to inherit the Queen of Air and Darkness' mantle, and she hopes they are at least as innovative & tricky in fighting the Outsiders as they were in killing her...
... And don't think she didn't take note, like the White Council did, that Harry has his own pixie army loyal to him and that they can do plenty of damage ...
It's questionable how much they can actually oppose Mab. Between CD & SG, Mab subverted all the Pixie-borne messengers Harry tried to send to Molly (trying to get Molly's help with "the parasite").
Of course Mab
absolutely noticed Harry taking down Aurora via Pixie warband; she will have immediately developed countermeasures for that, and anything derivative (such as Captain Hook's nail javelins); also their work intercepting Ethniu's kamikazes on the castle-roof, and more.
Mab has been living and breathing Winterfae tactics & strategies for over a thousand years, so even if Harry comes up with novelties, she will adapt incredibly-quickly (and she has an incredibly-deep playbook to draw upon).