Listed in the Patch #5 Now Live! Version Number: 4.1.1.4061076;- Minthara will still appear at Moonrise Towers if she was knocked out in Act I.
As for how to recruit her;- Commit a crime in front of her when you're ready to annihilate the camp
- Knock her out
- Kill everyone else
- And then just talk to Halsin, do the party and continue the story ^^
A part of me was kind of hoping we'd be able to do something like knock her out during the grove raid or something, the "temporarily hostile" part feels a bit like the exploit for you know who with Dark Urge. Not that I'm complaining, I'm happy to have Minthara without genocide or actively ignoring a major part of act 1, I just really like the whole thing with siding the tieflings during the raid but Minthara is someone I'm really interested in interacting with compared to Halsin.