Since dialogue stuff is getting posted here, Debbie should be saying "Kim and me", unless you want it to read as the grammatically incorrect mistake many people do often make. But, since these are college girls and Debbie seems to be from an affluent family, it's likely she'd say it properly.
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For any that might disagree with me, or who may be less familiar with the oddities of English, read the sentence without "you, Lisa, and" and you'll see what I mean - that's the test.