Thankyou so much everyone for all the replies and concerns. So far, nothing has changed with the discover card. My sis just got her taxes and actually paid most of mom's cards off or at least down. So for the time being, things are better.
I will just have to sit back and hope discover doesn't AA. But if it happens, it's not the end of the world. I have plenty of credit of my own. I am planning on gardening this year and then sometime toward end of 2016 or early 2017 see what happens with my own card. Thanks again everyone.