I'm a partner of a carer, and in my experience the best thing you can do is ask your friend how YOU can help her. I found with my wife that at first she didn't know how I could help her, she had so much on her mind, she didn't give herself a chance to think about how other people could help her. But it IS important to take the time to find things to do to help a carer. Even if it is as simple as organising a special morning tea for your friend and her mother once a week. Or doing the ironing for her. Whatever it is, its one less thing your friend has to worry about.