If you're going to have a future together, there's going to have to be a lot of healing in your relationship
I don;t know how long that might take and how long the 'tit for tat' might last but it's gonna be longer than 2 weeks Horn.
I'd try and not get distracted by things or people you don't have a great deal of control over right now.
Your recovery needs to come first.
The one caveat - I'm not a parent - if you feel addressing this now ASAP is part of your parental duty of care then that's your call - but I would make sure your motivation is really all about your step-daughter and not because you're pissed off.
D