Chronic low-grade fever

It could be related to her medications, what is she taking?

Generally what you are describing sounds like yin deficiency which is probably something long term and either simply getting worse or one of the medications is adding to it. Signs of yin deficiency are generally anxiety, insomnia, dry throat, perhaps constipation, afternoon heat, hot palms/feet/chest, nightsweats, etc.

That is an incredible amount of medication for someone her age and it sounds at least like the sleeping pills and the antidepressants are doing very little for her as you mention she still has serious anxiety issues. Certainly all of the blood pressure related medicines make vascular changes particularly near after taking the morning dose so that could contribute to your flushed feeling and is not uncommon. I would strongly recommend that you consult with a new physician for her (and only one) and have someone really sit down and look at everything she is taking. There are certainly Chinese Herbal Formulas that can be very helpful with anxiety, insomnia, etc. (among many other issues) but she would need to see someone locally as the mix of medicines really needs to be thought through. So, one, get a new doctor and have a long conversation with them about everything she is on and get rid of what is unnecessary and/or not helpful and perhaps add xanax or something along those lines instead of the stronger sleeping pills and anti-depressants. Second you can help her at least a little with sleep and anxiety by using acupressure at HT 7.