...but yeah she hurt the dude in black, and her powers don't seem to have grown that much, I mean she still uses the same shield when Ichigo is fighting Grimmjow right now in the anime (ep 166)...
Inoue's powers ain't suited for offense, she only has the one dude while all the other ones are for defense, and he's dressed in black, so if she were to have an element I'd say earth. Although the people themselves do fly around with wings and stuff, so maybe an highly unlikely air-earth-combo???