@L--Jay0 I'm sorry you've found yourself in what sounds like a toxic business relationship. I think @Sarah977 is right that Airbnb generally regards co-hosting as a private arrangement. I can only refer you to the Co-Hosting Terms of Service: https://www.airbnb.com/terms/co-hosts
Pay special attention to the wording under "Disputes":
Airbnb is not obligated to mediate disputes between Hosts and Co-Hosts. However, Airbnb reserves the right to conduct our own investigation and take appropriate action.
Am I right in assuming that you were connected to this host through the Co-Host Marketplace during the brief period when that was in operation? If so, I can understand your feeling that Airbnb holds some liability for the outcome - perhaps similar to the way eBay or Amazon are obliged to intervene in a payment dispute between a private seller and buyer. Since they shut down the Marketplace over a year ago, that's a strong signal that they have no intention of mediating between hosts and co-hosts any longer. I'd still recommend reporting this host's behavior, as Airbnb does still have the ability to suspend her ability to use the co-hosting feature. You'd probably still have to initiate a lawsuit to get paid, though.