Too much petrol from one injector? Did you diagnose this problem yourself? The petrol coming from your tail pipe may be infact condensation. If its spewing petrol from there while idling then it shouldn't even be able to run.
Maybe the injector isn't the problem, maybe its the spark plugs or the charging. Could be anything, atleast shes in a better place now. I'm sure oneday she'll go to someone that'll actually appreciate her.