@Kaylee6 - in defense of this host - computer programs are not failsafe and problems do occassionally occur. She is worried as much as you are about this mistake because it affects her too. If she cancels, she loses her Superhost status, gets fined, her calendar will be blocked so she is unable to take any other bookings for that time, and will be marked down for search results. She can be booted from the platform for things like this.
In your defense, you are not liable to accept the increase. If it isn't actually a computer issue, the host failed to keep her calendar up to date and she is beholden to you for the price she accepted. Since she had multiple days to review her calendar for any problems, you do not need to accept this increase for her failure.
You have an open case and you, the host, and the case worker will come to some sort of conclusion. Since it is months away, there is time to get this sorted. From a practical perspective, start looking for your second favorite hosting location in case this host does cancel. If Airbnb rules against her - which is quite likely - she may choose to forfeit everything and bail. You also will have to consider that you are renting from someone who doesn't feel like they were treated fairly, so I wouldn't expect anything extra without being charged for it.