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Hello. Thanks for the question.
It almost sounds like she has lost some vision. I have seen this a handful of times in cats with hypertension. When the blood pressure is high enough, they can detach their retinas or have bleeding of the retinas. This can lead to temporary or permanent blindness. One of the presenting signs we'll see, is acute onset vision loss and then this pacing and running into things.
I would get a good physical exam with a retinal exam and blood pressure measurement. If that is the case, we can sometimes reverse the signs with blood pressure meds. If the blood pressure and vision is normal, then I would also run some bloodwork including a T4. This is to rule out kidney disease, diabetes, liver disease and Hyperthyroidism. These can all affect a cat's demeanor and lead to these abnormal behavior signs.
I know it's a lot of possibilities, but one of the above is likely to be found as the underlying cause. From there, treatment can start to get her back to herself.
I hope this helps, let me know if you have any other questions.
I'm sorry for the wait. I was on all weekend in the ER.
It may be Hyperthyroidism then, as those cats can have some strange behavioral type signs. That would be my main rule out.