Okay she sits extremely well at home with only 1 hand movement. When around others she won't sit or do anything for me. I cant seem to remove her attention away from everything around her. What helps this?
I'm no expert, and I might jumble this, but hopefully I can make some sense. I try to think of the three D's when I am training with my animals: Distraction, Distance, and Duration. Anytime you add to one of those D's, you'll need to lower your criteria on one of the others. So say she Sits perfectly in your living room from five feet away with a hand signal. Awesome. Now we're going to move outside where there aren't any people or dogs, but still distractions. You can't expect her to still obey perfectly, you've got to up the ante a bit to keep her attention. Once she's doing her Sit perfectly outside around nobody, then you progress to somewhere where people and other stuff is still a ways away, and do it all again. Of course, this doesn't all happen in one short training session, but over the course of some time. (Depending on the dog, it might be a few days to several weeks for each step.)
I'd also consider having extra super yummy treats for those times when there will be more distractions, so that she might be persuaded that you are infinitely more interesting than anything else around. Set her up for success. Don't go so close to anybody else that she completely ignores you, instead turn and go another way and work her a bit more. Have a happy party for her when she does what you want.
Never use a reward as a temporary distraction.
I have to disagree with this, as rewards can be a great way to break a cycle with a dog. For example, when I was out with my dog one day, keeping her on the leash as I should, we were charged by a couple dogs. Rather than try to pick up my girl and run, which could trigger them to chase, I threw a handful of really yummy smelling treats and quickly moved off to the side and away from the dogs, while stuffing treats into my dogs mouth as well. Or, in another case, with a fearful dog who could not deal with traffic (in NYC no less!), I pretty much turned into a jackpot machine for quite a while so that she would be thinking about all those nummy treats instead of the big scary smoke machines.