Wifes Driving

Somebody has got to help me. I can't figure it out. My wife when shes driving is so freaking horrible, I've tried to explain but she still is killing me. We have pp and yet she still seems all over the place with the throttle, i can't figure out how. when i fall she power turns first....then slows down. Then when we turn around she doesn't cut back through the rollers and keep the same line, she runs parrallel. Its to the point i'm wanting her off the boat, but one problem she's the only driver I got. Women I'd love to hear your approach to this. Or husbands that have experienced the same problems!