This had come to happen because Dugu Xiaoyi had heard someone say that a man and a woman they could never be separated once they've 'cooked rice'. The man would then have to take responsibility of the woman. Dugu Xiaoyi obviously had no idea about how this particular 'rice' was 'cooked'.
Moreover, she had no idea about the effects the aphrodisiac would have. Dugu Xiaoyi only knew that the aphrodisiac would help her with the cooking of this rice. And, that's why she had created such a huge drama.
"Brother Moxie is mine; he's all mine! Humph!" Dugu Xiaoyi opened her luggage trunk, and started to pick out some clothes. And then, she started to try on her clothes in anticipation of what clothing would be more effective in making Jun Moxie cook this delicious rice.