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marianne says

Is part C Advantage Medicare? She has A and B only.
I think her Anthem is a managed care plan.
Her coverage for ambulance is 0 copay.
Her coverage for Er/Hospital is $50.00 admit/$50.00 discharge.

She has A&B - but her medical benefits have been assigned to a Med C advantage plan. She pays a monthly premium (or doesn't depending upon the plan she's on) and her part D drug plan is bundled in there. The part A/B copays for ER is higher than the amount you listed, which verifies she's managed care and her choices are severely limited. You've got an insurance case manager who will be forcing you to move her, or the wrath of the plan shall fall upon you.

Time is of the essence. They'll move her with, or without your permission.

Yes, they actually can just discharge her to a lower level of care, part of the managed care agreement she signed onto. Her needs aren't acute, they're sub-acute and can be managed in a snf or at home with home health assistance. Even the antibiotics (abx) can be administered in a snf or acute rehab if it's IV abx.

Good luck.