We were able to handle most of it in just 2 weeks and have the house remedied for the tenants.

It's a defined default on the mortgage or deed of trust, with a defined remedy (acceleration / due-on-sale).

It's a best business practice and it motivates the unmotivated to seek other remedies including housing assistance, moving in with someone else, getting a new job (workers are in short supply!).  

@Ryan Bolesky i have never been to closing, however the mind always worry before the big day. sort of like a system check, just like a test, cross your T's dot your I's and check with your team. and if the event something does happen always think what ever could go wrong will be a minor oversight that can be remedied

Again, it comes back to your remedy if they don't keep it up.

If the date is "of essence", the lack of action creates a breach of contract but most contracts do not provide for a remedy for breach.

I got a quote to get it treated for a few grand but remediation is estimated at $20k.

While she's working, every deposit she makes will lower her balance, save interest, and increase her line available to pull from. 

@OP: you will have to take immediate remedial action as water damage can cause all sorts of secondary problems (mold etc.).

The thing about this COVID-19 virus, is that there is no certainity that remedies will be found for it, even in 2021, despite the best efforts of scientists in laboratories.