Looks like it has been flagged as inactive. That must have been a good vacation!
If you log in to the site there, I think you just need to change the sub-domain back to the original .. hopefully that should work.
If there are no active payments/credits (either through Crowd Pay, a promo code or a PayPal subscription), a site that has not had any members log in for ninety (90) days will be flagged as 'inactive' by the system. At this point it has its subdomain changed to free it up for a user who might want to use it.
Another ninety (90) days after that, for a total of a hundred and eighty (180) days, if no one has checked in on the site and no one has changed the sub-domain, it will be flagged as 'abandoned' and potentially be removed from the system. A total of one-hundred and eighty (180) days may seem like a long time, but we want to make sure that the site is intended for deletion and give our customers ample time before we delete a site.