How do you shake off an overly friendly person?

Have you ever met the friendly person from hell? This is what happened. I met my husband in the store and she was talking to my husband like they were long lost relatives. Touching his arm and talking to him really close. When I came along he introduce me and then I realized they just met. She suddenly hugged me and kept touching my arm and she even threw her arms over my shoulders keeping me close to her. She went on with her life story. You can tell she is a person who loves meeting people. She was excited because my husband and her are from the same country in Africa. Any way my husband set me up. He had me come over so he could slip away from her and figured I would find a way to get away. It took some doing but 10 minutes felt like hell, since she doesn’t understand space boundries. My daughter is also like myself. When people are really close we feel like trapped animals. If I would’ve stayed a second longer I probably would’ve said something nasty because I felt she was hunting me down. However, I know it is just her personality and she is overly friendly.
What is a curtious way of shaking off a really friendly person?