The Yuumi Issue

I recently played a ranked game where I was jungle and we had someone pick Mid lane. Okay, so a troll pick, whatever I guess. Just farm hard and win right? Well, that is until she sits on me and helps with my leash only for me to realize she brought . She proceeds to my first camp, taking the level 2, and refuses to detach all the while smiting the most valuable camps whenever the spell is up (probably took summoner spell cdr runes just to dig in even more). Now I am being held hostage all game with literally no way to stop this griefing cat from being attached to me or taking my camps. I was starved of CS and levels all game and was even almost reported by my bot lane after afking long enough for the Yuumi to get off me.

I really hate that there is no apparent way to stop this form of aggressive hard grief. The worst part about it is that their KDA looks perfectly normal afterward.

Does anyone have any ideas on how either players (or the balance team) can avoid this?

The only solutions I was able to come up with were to have an option to either kick off of you (or never allow her on in the first place) and or to not let her take or any of its respective items.