Don't know what your problem might be. But I would use CGMiner in dynamic intensity mode so that you or your Grandmother can use the computer for other things while mining.
May want to check the firewall and router to make sure it's passing traffic on whatever port your pool is using.
Sam
I've downloaded CGMiner and tried it, it produces the same results... shows that the card is working but won't submit shares. All she does is check e-mail and do light browsing, but yeah dynamic intensity mode is nice.
Firewall/Router are good to go, she pays less for electricity than I do so 4/5 of my rigs are here at her place and they all submit just fine. Been 2 days now, running at 115mh/sish with no shares... boggles the mind.