ok,to train for leave it,you need to put a treat on the floor in front of your pup,and have another in your hand ready.as soon as she try to eat the treat on the floor,cover it with your left hand,and give command:"leave it",when she stops trying to eat it,give the treat in your hand with praise.
then uncover the treat on the floor and repeat as before.this could take a little time for her to get use to.
with my 2 gsd,i put a treat in front of them and say "leave it"then i wait,and then i give the command "take it" and they take the treat.
now the "drop it" command,a little harder to deal with but possible.
first don't use treat because it will be gone in a flash.use a toy or something she likes to hold in her mouth.
have her take the toy and give the command to drop it,as you grab the object put a treat right in front of her nose and again give the command of "drop it"if she let go,give her treat and praise.
you may have to be more aggressive to remove the object at first,but she will let go if the treat is yummy!
just train for 5-10 minutes at the time,2-4 time a day,she'll get it.
if anyone would like to add to this method or have a better solution,please do.
i taught my boy leave it by placing a treat on the floor. i have my dog on the leash. i walk him up to it and say leave it. i don't let him touch the treat but i let get so close that only a hair is seperating him from the treat. when he's close to the treat i say leave it and i turn or pull him from it. i just walk him up to the treat say leave it and turn away. now he does it off the leash. when we're in the woods and he wants something i think he shouldn't have i say it and he walks away. now when i play ball with him i throw the ball he retreives it and i say drop it and he does. i didn't really teach him drop it he just does it on his own. in teaching leave it we only did it in short sessions. we would only approach the treat 3 or 4 times in one session but i did it 3 to 5 times a day. everything we taught him we did in short sessions but 3 to 5 times a day. my GF and i always discuss his training so we're doing it the same and using the same words. well i have to go, my neighbors Shep just came over to the fence and barked and that means let Loki out. so i'm going to put him in their yard. i love watching them run together.