She chooses Ishqi's dress (and Ishqi has to wear an ill fitting dress) which leads to Ahaan putting his coat over her in the wardrobe malfunction episode, which later leads to the "meri shaadi toh aap se nahi ho rahi hai na AVM"
Also, not directly, but she agrees to go with Mayank in the train, which then leads to the Ishqaan lodge episode.
Also on Rheaan marriage announcement, Rhea said that Ishqi is their guest and would not serve them. So we got a glass tod then bhagam bhaag Ahaan to bring ice for Ishqi scene.