If she s trying everything but sitting, at first click and treat for lowering her back legs and butt. Then try to get her to sit down all the way. This worked great, but now my dog will only do this action if she sees I have a treat. Don't forget to reward with the real thing. As your dog succeeds with that, stop pretending so much.
Most luring motions turn very nicely into hand signals.
You start by clicking and rewarding the barest hint of the behavior you want to end up with, and then concentrate on taking small steps closer to your goal. For example, you might click and reward every time your dog turns her head to the left. Soon she ll be doing it more and more. Then you only click and reward when she s turned it further. Then only when she turns it far and takes a step towards the left.