Also if/when she does step up reward her then put her right back where she was (at least most of the time). Too often birds learn HOW we use the step up command: when they are having fun tearing apart our furniture, or when we are going to put them back in their cage, when we are going to leave, etc. Think of the consequences from their perspective - if every time they step up they are being taken away from something fun its no wonder that they don't like it.

Have her step up, reward her, then put her back where she was.