I am rooting so hard for her to do something freaky, but knowing her personality, It'll probably be something genuinely nice and supportive. I'm not falling for the sesbian lex cliffhanger.
As for her plan I'm assuming Mochizuki is going to ask Konno to help her seduce Tanuki or accept her as a partner for her brother (her name is used so infrequently I had to go back to chapter 2 to find it).