OP, you sound like a wonderful, caring person. If you don't mind my saying so, I think your rav was wrong for saying that this woman was a nebach case. May he never know what it's like to be disabled.
Some people are put on this earth in these circumstances so that other people can get the mitzvot of helping them. Some people who are disabled have a lot to give the world, if others would only pay attention to them.
The schar you are getting for this is immeasurable, and if the rav knew only a fraction of what you were getting, he'd jump over the mechitzah himself to help her!
~Signed, a hard of hearing person who occasionally loses her place.
“Nebach on her” has a different meaning than “nebach case”.