My mother-in-law (70) has Alzheimer's and it mimics Parkinson's. Had another UTI came home on hospice &24 hr care 3 wks ago. Any ideas?

Mimicing Parkinson's is more indicative of Lewy body dementia as mentioned below. AD and LBD can co-exist, however. It's referred to as Mixed Dementia. Swallowing difficulty and poor muscle control are usually end stage symptoms and aspirational pneumonia is certainly a possiblity. Being a mom of teenagers, I think it may be time to look for a care facility for your MIL. A speech therapist can help evaluate her swallowing issues. The responsibility of caregiving gets tougher and tougher. Know your limits.

When my Mom had a "good BM" her blood pressure would drop and she would sit in her chair and take a little nap.

My daughter is also an RN and says she would never put anyone on a feeding tube that is like your Mom. Once inserted, can't uninsert because then thats considered starving them. Not sure how Hospice would handle this anyway. I would call the Hospice Nurse and run this by her. She is suppose to be available 24/7.

A swallowing problem is the first phase if dying. Then they aren't hungry or thirsty because the body is shutting down. They may rally but that maybe short lived. You need the Nurse to come and evaluate the situation.

Your mother is having a very quick progression here, no matter her young age. Swallow deficits are common across the spectrum of neurological problems. Lewy's Dementia is notorious for it, and what you just described sounds classic for Lewy's as well as others. With Lewy's a person becomes frozen, sometimes with a tapping leg or foot, and cannot swallow for some period. There may or may not be hallucination. But just one symptom of Lewy's.
Important thing here is that you are dealing with rapid progression and with the swallow deficit. With it you are now looking soon at a decision about whether or not to administer artificially administered nutrition. I already have written in my Advanced Directive that dialysis and nutrition such as this is forbidden. As a nurse I know where it leads. So you are looking at a tough decision coming, because continuing to feed is going to mean aspiration pneumonia due to fluid and food in the lungs. Did your mother make her wishes known to you early in her life? Do you plan to move into palliative care or hospice care?
I am so sorry. At the very least I think this is soon 24/7 care that you will not be able to do at home. I know you will have spoken with her doctor about this, and I hope your Mom will have a swallow evaluation, because continued eating may cause pneumonia at any time.