[detruncate]

I don't hate pf. I might also fold or 3-bet depending on my feeling after watching Villain for a while.

The flop 3-bet is fine, but once you get capped by Villain you're usually in a world of trouble. It's very unlikely that she raised with less than 88 pf, or capped the flop OOP with two overs (unless she also has a diamond draw) vs a LAG and a guy who's going to be on a PP a lot after the pf coldcall + flop action. It would suggest a level of aggression you probably would have taken the time to talk about. It's possible you're on med suited connectors like QJs/JTs, or even hands like AJs/AQs if you're not very aggro pf and just want to get it HU v UTG+1 (with or without diamonds in all cases), but that's still a strong reaction from UTG with what is often very few outs if she's just on overs sans diamonds.

I just check through the turn. Betting doesn't really protect you from anything since there's a good chance that UTG is on a bigger PP that she's showing down unless another diamond falls and she doesn't have one or all hell breaks loose on the turn/river.

If UTG leads the river I fold UI. If UTG+1 leads and he'll bet with pretty much anything, I consider raising to try to discourage an overcall from UTG... though the chance that she has an overpair is diminished quite a lot after checking 2 streets unless she's particularly weak/tight, so just calling with the hope that she doesn't overcall would probably be ok. If a diamond falls I just call/bet if checked to.