Makoto probably just wanted to put Rin in a position so she could have sex with him quickly back then. but she ended up going to the hotel just in time to when Ohtori was leaving. she probably also regretted sharing that information about the grandma and is frustrated to the point that she lashed out at Rin about using the stigma on her as she is desperate to see if she can roll back what she orignally planned for her to do to him.
good point tho about Chizuru, she might actually be in trouble now. Hold up...Is this the part where Kamon will finally do the deed and lose the stigma? Wonder what she would feel after the stigma's gone