airbnb “support” has become an oxymoron.
I approve all of my guests before I let them book. Communication style is a good berometer of a guest’s behavior during thier stay.
I agree with @Mark0. Maybe this is a blessing in disguise, but you need to proceed within stated policy to cover yourself.
I’d read up on “no shows” in the help section ( link below), follow the policy exactly, and make sure everything’s documented in messaging with the guest and “support” so you have it all for reference.
https://www.airbnb.com/help/article/309/what-if-my-guest-doesn-t-show-up-for-their-reservation
If it were me and the check in time passed with no communication/replies from the guest I’d make sure to message her and tell her that if she doesn’t respond by the end of the check in period (my cutoff is midnight unless prearranged) you can’t hold her reservation, it will be counted as a “no show” and note any lost deposits and other costs for the rental time as specified in your cancellationpolicy.
Still no response? Then you should have the cooperation of “support” to cancel without penalty, then open your calendar and manually release the dates so you can book other guests.