I'm sorry about your Mom. It sounds like she's going through a lot, as are you. Leon offered some great articles that I'm sure you'll find very helpful.
Diet can play a very important role in making sure a person with COPD is getting the right nutrients. Many people with COPD find it helps to eat less, but more frequently. Many factors, including medication play into how a person digests and how much they can tolerate eating in one sitting.
What type of allergies is your Mom suffering from? Seasonal or medication? If it's seasonal, make sure she speaks to her doctor before even taking over the counter medications as you would want to be aware of any interactions with what she's already taking. There are a number of natural remedies that may help with allergies. Certain foods, supplements, essential oils, and even something as simple as a saline nasal spray are a few things that come to mind. But again, before starting anything new, be sure and speak to the doctor.
Please let us know any other ways we can help or other questions you may have.
Lyn (site moderator COPD.net)