Ps if you're using a variation of "clicker training" - and using a clicker or the word "yes" to let your dog know when they're on the right track... you only add your cue word eg "drop" when you're getting the action reliably.
So first it might go "sit" - "yes"- "treat/reward" (repeat 5 times with something she knows or just "yes" everything she does that's different eg ear flick, looking at you, looking at something else, looking at you, standing up, getting excited etc. 5 treats, and then look to focus on stuff that works towards a drop eg a sit - don't cue at all when you're looking for something new. You can modify the environment a bit - eg if she will normally drop on a mat or pillow or in her bed - start your training for "drop" there. And if you can get 5 drops on her bed - then adding the cue - when she's on her bed, then try next to her bed... etc.