@Hollyj
I posted about being in a similar situation just yesterday .
We contacted the Urgent Support Line which is a phone line available 24/7- so I suggest anyone in this situation does the same.
They will talk you through what you need to do to make a claim . You have to pay upfront and there’s a limit on how much you can claim back $1500 and $150 is deducted from the overall claim . They will also change the end date of the sit so that you can apply if there are any suitable ones .
See if there are any other sits in the area or that are within reasonable travelling distance .
Looking into alternative accommodation (doesn’t have to be a hotel we also looked at booking.com & Airbnb) - the alternative must be within 20 miles of your sit .
Pay upfront then submit the receipts to THS along with screenshots of the messages where the owners says that they are coming back today .
All the best