Sorry about the financial finances. That must be difficult.
I'm wondering...have you spoken with ExH about it? Not your personal situation, but in regards to your daughter and child support. $88/week isn't much. I pay many times that even though we have 50/50. Considering ExH & OW seem to want to be friends and a happy family playing Mario Kart together, I wonder if he (or they) might be open to providing more or even just picking up some expenses he's not already covering (cell phone, extracurricular activity...whatever). Or, perhaps I'm completely off base and ExH would balk or throw a fit.
Me:39 Ex-W:37 M:7 T: 9 S:6 D:3 BD/IHS/Confirm EA/PA: Feb '20 OM1 affair ends: May '20 W/OM2 & moves out: June-July '20 W files for D: Jul20 OM2 confirmed: 9/2020 Divorced: May '21