Maybe keep checking this site, they've listed the sweater brand she's wearing and they might update it if/when they ID the bag. Or you can look at past outfits to see if maybe you can get an idea of a brand she's been wearing
http://www.celebritystyleguide.com/?op=item&sid=22&cid=73&page=1&item=5751
http://www.celebritystyleguide.com/?op=item&sid=22&cid=73&page=1&item=5751