So my conclusion from this chapter and previous is Risako is some sort of yandere, trying to make distance Kauro and Reichii before back to Kauro.
If the author goal is to make us not hating Risako because "She's actually like Kauro but showing it in a very own unique/unnecessary way because she's like to see people suffer/yandere and hoping Kauro would cling to her" I gonna say "na ja"