I agree with a lot of the posters here, that finding a way to pay it back is a good idea. Hell, it may not even be monetary paying back like doing chores around the house for her or things like that, or cooking supper for her etc, but something as a thank you for her generosity thus far.
I loathe being put on speaker phone, it's never clear and it bugs me that the person I'm talking to is too lazy to hold that incredibly heavy receiver in their hand to their ear. I wish speaker phone was abolished.