It sounds like an admission to a geriatric psychiatric unit (they specialize in dementia) may be in order. They may be able to get her stabilized on some meds that will help prevent agitated episodes. That may be an AP or something for anxiety. I'm not sure Haldol is considered a good med for the elderly; no AP is but I think that the atypicals are more preferred when one is needed. APs increase the risk of falls and confusion. Haldol was never used commonly with my patients and I worked in a number of places that specialized in agitated dementias.

Does the respite place have a dementia unit? Those are generally set up to be able to handle agitated people and not get too upset about it; agitation is a way of life there.