@Dan Gustavson although I don’t live in Salt Lake, I can make some recommendations based on my personal experience with an eviction in Ohio (Cincinnati).
When is her lease up exactly?
You absolutely can post just as you normally would. You can even start the eviction process if you really want to now, but I would start with the notice.
As you said, the declaration only applies if she has gone through all of the steps and exhausted other efforts of payments. I highly recommend getting advice from an attorney. The best $126 reorientation I ever had.
If you are sending her a non-renewal, make sure you indicate that she must vacate and a holdover is not covered by the CDC Moratorium. Landlords have rights to take their property back after the lease is up.
I didn’t have a non-paying tenant but I did have a holdover and a successful eviction during the moratorium. I know the process and courts vary state by state, but it’s doable.