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If I was Shampoo, I would try to condition Ranma to the point his Danger sense doesn't see her as a threat and allows her to get close. To remove the bad memories of Shampoo.
Also the idea of getting Ranma on a training trip with her and Cologne would help allow her time to condition. All she need do is give Ryoga or someone a techniques to require the training.
Just some ideas. As well as ask, is Shampoo going to condition more people. Like the Tendo sisters?