Agree with posters saying this is not typical teenage behaviour.
The untreated ADHD is probably a huge factor here.
I also wonder if your husband is the only one with MH issues. That is, I think you may be in denial about whether your dd is suffering - with depression, with inability to control her behaviour.
It's very tough - ideally, you'd go to the GP and try and access some sort of therapy - for her ADHD, for helping her with possible depression/anxiety/self-awareness for modifying her behaviour and helping her to control her own self.
I wonder if fear is at the bottom of this - she doesn't know how to look after herself and is frightened/ashamed - and self-medicating with weed.
You probably have had enough on your plate with your DH and her adhd for years - and you now find this overwhelming.
Maybe family therapy?
You all sound as though you need support - and hope. Hope that things will improve and that you can all cope with what is clearly a demanding situation,
In a way, it doesn't matter where that 'hope' comes from (your dd getting and keeping a job/therapy/a supportive member from your wider family) but I suspect you need it,
Therapy/counselling might be the easiest and cheapest thing to access. Either for you or your dd.