Hi Hammerman,
Step kids are a great pain in the butt and a source of grief in many a household. My stepdaughter was an absolute pain, dod nothing, made the house smelly, never contributed. I moaned and moaned and got no-where, finally one day the rose tinted specs fell from my hubbies eyes and after a blazing row she left. We had to then bail her out and she moved back in but no change.....so she left again.
Unfortunately, all the talks about how much it costs in the real world, working hard, getting a job and an education fell on deaf ears. She now lives the life of Riley with a millionaires son and doesn't lift a finger...Just in those dark times, when it's pay a bill or eat, I wonder who got it right.
You are totally right, she should pay her way but don't let it spoil the life that you and your wife have, it really isn't worth it.