How old is she? We've been through the worst two years of our lives with our daughter (and bearing in mind I've lost both my mam and my dad before that: this has been worse) but we're starting to see a fair few green shoots of spring around the corner as she's got a bit older. Definitely some of this is down to time passing: not just hormones settling down but brain development too. Not out of the woods yet, but at least a better place than we were, and I'll take that.
Not quite the same as your daughter, but similar ball park in some ways. As well as all the work with her you'll have been doing for months (and it is exhausting), it can easily knock the hell out of relationships with partner almost without realising. Tough times, and I hope you see progress soon.
She is 14.. 15 in January. Kicked in start of year