Hi Cindy,
Over the last 5 years your mom's body has learned to cope with a chemically induced menopause. (At her age, a double whammy, as she would have already been through natural menopause.) That means her body has been functioning on just a tiny amount of estrogen. Once off the drugs, estrogen produced by fat cells, the little amounts she may have still produced by her ovaries, and what she gets through phytoestrogens in food are all now accumulating and starting to fully circulate through her blood stream and into her cells.
While this is not a harmful change over the long term, it is sudden, is what is causing her symptoms, and will take a while for your mom's body to get used to being back to normal. Tell her to avoid soy products, yams, red clover tea, and other foods that are very high in strong phytoestrogens (do a Google or GoodSearch to find out what foods those are - she needs to avoid strong phytoestrogens, weak phytoestrogens are ok) until she is better getting her equilibrium again. Then if she wants to reintroduce those foods into her diet, she should do so slowly.
Grape seed extract with resveratrol should help. I recommend she take it for a couple of weeks at least, maybe a month. This will help slow down the influx of estrogen back into her system. Take the higher dose recommended on the label for a week or two, then go to the lower dose on the label for another week or two.
She also needs to drink plenty of pure water. Even though she is no longer taking the pills, she could still have some of the medicine in her system for as long as 6 months. Drinking lots of water, plus getting some mild exercise as she can tolerate it, will help her to detoxify.
I wish your mom the best.
Sincerely, Tre