I would turn that 40 dollars into 1 dollar bills, run up to her and slap her across the face with them, then say we arent friends anymore, and leave like a baws.
Dude, ah. That's awkward... well. Maybe bring it up and ask her why she lied about it? If you don't want to sacrifice your relationship then simply tell her that you want to about the scenario. If you're fearful she's not to be trusted ever again, then either gradually stop talking to her or burn that bridge ASAP.
I'm sorry that happened to you. That has to be so awkward