Did you by any chance try "find girls" -> "Lina" when at school?
Seems to me like there was some route that I expected progression to be done (to me, "logically") in one place, when the game was written to progress elsewhere. I don't think that was with Lina, but it might've been. (Oh, and did you already get the dumbbell from the pawn shop and give it to her? That might be needed, as well.)
edits:
Other thing to check: the phone, go to characters, click on Lina. There's "hints" as to what needs to be done next... sometimes they're much more "direct: go to X and do Y" but it might help.
It's been a while, since I did any of that, so I might be wrong. I kinda (to borrow a term from the discussion a few posts back) burnt out on the story lines. None seem to be going where, or how, I was hoping/wanting them to go. And then there's the whole "no turning back" decisions in a few places that... well, instead of a couple of "are you sure" screens, a bit of forewarning of how those routes go would've been much more useful. (But, that's probably on me for not looking/checking posts on here.)