Well, if that's how he's going to be, she's going to muss his hair again. "No! Mister Otter and I love each other and we're going to run away together and you can't stop us." This is delivered in her best 'petulant teenager' voice, which, well... she got a lot of practice with when she was younger.

She clutches Mister Otter to her chest and retreats to the other end of the couch, which leaves her poor feet exposed and with nothing more than socks to defend them from retaliation.