I see you are offline, so I will change over to the Q&A function as opposed to the chat.
Now David, I am very concerned about Po. You are right to be concerned that she is in discomfort both because of her labored signs and the "strange grinding noises". The latter is actually her teeth grinding and it is a very common sign of pain in our pocket pets. It doesn't mean she has oral pain, instead it tells us that she is generally painful. And this suggests that the underlying cause for her "stroke" is not just a blood clot causing paralysis (where she'd feel nothing) but instead likely has an entity (ie spinal tumor, etc) causing her pain.
In this situation, you have done well with your supportive care. Still I am very sorry to say that she is in a state where home treatment alone will not be enough for her. At the very least, she will need injectable pain relief from her vet. (There is nothing safe or of equal strength that can be given at home). That said, I do have to warn you that if she has severe pain and paralysis, it is quite possible that the vet's exam will yield something untreatable. Therefore, if she is suffering like this and her condition is not caused by something the vet can treat, then letting her go may be the most humane option to allay her pain.
I hope this information is helpful.
If you need any additional information, do not hesitate to ask!
Please take care,
PS- I see you have rated me for the above before I had a chance to give you my thoughts. Still I do hope you check back and see my further thoughts here about the gravity of Po's signs.