Daria is pretty much an INTP in an exaggerately (and stereotypically) ESfJ world. I think she has some F tendencies sometimes but not enough for INFP. I could see INTJ, but from the episodes I've seen, she would be a pretty atypical J.
As far as ISTJ goes, I think the moments later in the show when she appears SJ are very inconsistent and a result of sloppy writing rather than an expression of what character she was orginally intended to be
This is what I suspect, at least. I would need to watch the whole series to decide this and better explain what I mean here.