One of the most helpful things anyone has said to me was a friend (herself autistic, with autistic daughters too) introducing me to the Rule Of Three.
She said that with autism, you knock a third off the chronological age, to arrive at where they are probably going to be emotionally. So your daughter isn't really 19 in maturity - she's 12 or so. The 'packaging' may be clever and present well, but inside she's still a child. She won't always be - she will grow up, too - but a lot more slowly.
Trauma does the same thing, and sadly my daughter's been through quite a lot (I had breast cancer, she was bullied by a deeply unpleasant teacher, though thankfully our LA were bloody brilliant and supportive, as they were already involved with my eldest) so she's even younger for her age - probably half or so. And I do find that helps me in being patient and hopeful that she will get there - just a lot more slowly.
ADHD is linked to being atrocious with money, too, because of the impulsivity and the struggle with considering long-term. It's frustrating that it isn't recognised as a thing with our kids, and they don't have additional protections in place for a while longer than a NT kid would need.
I really do feel for you. It's the old thing, isn't it - small children, small problems; big children, big problems. And when you have ND kids, that's on steroids.