When you said she doesn’t finish things, it made me think ADHD. I can relate, as I think I have it but was not diagnosed. I think several members of my family do, too, also not diagnosed. My youngest son was diagnosed in second grade, but is very mild and he tried the meds briefly in fourth grade, said he didn’t feel like himself, so I took him off them. He’s done pretty well in school and is outstanding in music and holds leadership role in school now. My oldest son thought he had it, but he always performed just fine in school, so I never pursued it. He has now gotten himself tested and I think he is taking meds, although I am quite against that, but he’s an adult now so I have no influence anymore.

This is a good article about how is can be very different in many and coexist with other issues.
Adult attention-deficit/hyperactivity disorder (ADHD) - Symptoms and causes - Mayo Clinic