The passive route is much more interesting. ISTJs do not like strangeness. This is the key to getting them out your hair. And it could be fun.
Grow your hair long; start writing poetry. Paint abstract paintings (ask her to model, dressed as a rabbit); learn the banjo and sing spirituals really fast. Become an athiest and start quoting Dawkins at every opportunity. Tell her you've become a pacifist and have a copy of Wind in the Willows (open, strategically, of course) placed in the bathroom.
Paint your toe-nails black and wear flip-flops! This might work, without any of the above.
In short you must become an ISFP. And pronto.
Good luck. May the force be with ya.
You'll need it.
This is a brilliant plan because it also works to attract xNFPs at the same time! lol