It seems to me like Shizuka is making a serious effort here. She loves Mio, but the memory of her feelings for Kaoru is still very strong. This can be a really difficult situation, and I don't blame Mio for being jealous, but I would like to commend Shizuka for her efforts. You can do it, senpai!
Also, you can't abduct someone who's willing. You can elope with them, however ;-)