@Julie4700
1) Can I do anything about her blatantly lying?
Refer to: https://www.airbnb.com/help/article/2673/airbnbs-review-policy
Money quote: "Airbnb doesn’t mediate disputes concerning the truth of reviews. "
So that's a no.
2) In the future if my the accommodations/amenities are a huge issue should I just vacate the property and then contact Airbnb? What is the best way of handling a situation where the listing becomes unlivable?
See here: https://www.airbnb.com/help/article/2868/rebooking-and-refund-policy
If the rental is not habitable due to any of the travel issues listed, including a malfunctioning major amenity (e.g. A/C), and your attempts to resolve it with the host have failed, you should contact Airbnb no more than 72 hours after discovering the issue, with evidence, and plan to relocate as soon as possible. The stay will still be eligible for reviews from both parties, but ideally you'll be able to find more suitable accommodation.