With clicker training you first have to teach her to touch something, a stick, anything. When she does, make a cluck sound, like a chicken, and offer a tiny reward. Within 5 minutes she will be looking to touch the stick whether held high or low. The click means she's done the right think and the treat in the reward. The timing of the click is important, she'll learn that the treat is coming. To pick up a front hoof, gently squeeze her chestnut. As soon as she barely lifts her hoof, click as she's doing it, not after, then treat. At first she may barely shift her weight off that hoof but you need to reward that. Think of progressing inch by inch. When she's good with her fronts, and you have to train both sides, she may catch on faster with her hinds. Place your palm over the cap of the hock and try squeezing there. Some respond, others don't. But reward the slightest try. Once she hears the first click and is rewarded she may, as it sometimes happens, try to hand her hoof to you to get her reward. This can be seen as the horse attempting to kick so you need to be observant. Always slide you hand down the hip so she knows what you are doing. Your body blocks her sight. Be sure to use the word "foot" or "hoof" each time so she learns the verbal command.