She's trying to sidetrack the conversation into something more plain because she feels her attraction going off. Don't let her be the one to lead the interaction and do that. What you should do is use her attempt to bring energy down to turn it into a flirt:
"my stomach hurts"
"you're just saying that because you know I give the best stomach massages and you want one"
then after her reaction, say something more logical that brings the energy down, that way she realizes you're socially calibrated and can lead an interaction.
Say something even as bland as talking about the weather, "god I love days with weather like this"
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