Kikopup's video should help you.
Just a little extra exercise that is helpful...
With Missy on-leash and sitting or laying next to you, recruit a volunteer to walk up to the two of you. If she gets up or tries to jump, the person immediately turns around and walks away. Repeat, repeat, repeat. Once she will stay seated or laying(your choice) when another person approaches, have the person approach and then reach out to pet her. If she gets up or jumps, person turns around and walks away. Work your way up until Missy can sit next to you calmly while a person walks up to you and pets her. You can do this in your yard with a friend or relative, at the park, or even at Petsmart. Anytime someone approaches you to pet Missy, just explain to them that you are working on Missy's manners, please don't pet her if she jumps. Not everyone will listen, but at least try.
It's important to do this exercise with a variety of people. If you know some kids of various ages that are willing to help, definitely get them to! But with kids, make it a little tougher. Start out the same as above--your goal is to eventually get her to sit still while a child calmly walks up to her and pets her. Then maybe the child jogs to her(but walks away, not runs away). Then maybe the child runs at her. Then the typical cute doggie reaction from a kid--screaming, arms flailing, running at her.
In time she will learn that jumping on people makes people go away, and gets her no attention at all. You can tweak that exercise a bit at home. Recruit someone to come in. If Missy jumps, they go back outside. If it's just the hugging or whatever that makes her lose it, then have someone come in and hug you. Soon as she jumps, you both turn away from her or walk outside. Jumping=I get left alone and don't have any fun.
If she tries to keep you away from other people ("has to be between me and whoever I'm talking to, hugging, sitting beside"), she goes away. You control who is close to you, not her. If you are sitting by someone and she tries to push her way in between, you either use body blocking(no physical touching of any kind, literally just moving into her space, taking her space away) to "push" her out or actually put her in another room or outside or something.
Hope this helps.
Good luck and be patient and consistent with her.