auntred25, very touching post.
help her have space. It must be difficult to cook, if anyone can take over the chefs position it would probably be helpful.
For the metallic taste there isn't a good remedy, but heated food seems to enhance the taste, whereas cold food lessens it. For some acidic foods make it worse. She might try avoiding foods prepared in metal dishes or canned foods. If she has a favorite ice cream or popsicle, mints or cinnamon candies could prove helpful. There is a product called metaquil mouthwash that I've heard helps. Amazon
These are things that should just be there for her to notice ; I'd guess she doesn't need advice currently.