I'm no expert so hopefully Rosie or somebody else may be along soon
How long have you been training?
Are you carrying treats or a toy in your hand? Is that what she's trying to jump up at?
As for the getting bored whilst she's waiting, I can relate to that with Harry, he just can't wait to have a go so I try to distract him whilst others are running, although obviously impossible when I'm running my other dog, this week however I did find something that seemed to quieten him down, I'd try the "watch me" etc so put him in a sit-stay & walked away & simply kept walking past him, going back on occasion to reward him & so far this has been the most successful thing at keeping him quiet & focused on me as opposed to the dog that's running