Sounds like a respect issue. She will only do what she wants and if she's pushed outside her comfort level or to do more work than she wants she acts out. My mare would also rear and I just ignored it. Once you gain her respect that will disappear.

You need to get control of her feet. Get her moving, if you have a round pen thats a good place to start. If you can only lunge and her feet lock up on you (she decides she's had enough) get that whip and really crack her on her neck, drive her away from you. You shouldn't have to chase her rear around. If she still doesn't move whack her again but harder. You have to do what it take to get her moving. If you whack and she isn't going, you aren't whacking hard enough to make her feel uncomfortable.