FICTION: I have confused myself...

I changed the ending to my story which I like and I thought I had it nailed and ready. But today I go back to it and now the rest of the story is unraveling and nothing makes sense and when I change one small thing to make the end make sense, other things stop making sense and I am incredibly confused!

>>The initial idea was that Mary fantasized about having a man's life like her husband's. She tried on his clothes when he was out. One day he came home and was demeaning to her and she snapped and hit him over the head. She trapped him in the house and took over his life. Eventually she realized it was too exhausting for her and she wanted to go back to dresses, cooking, cleaning and make up. Patrick however had decided he enjoyed it too much and didn't want to go back.<<

Nooow... I made the ending so that she goes out into the world and realizes women can actually have lives of their own and she goes back to confront Patrick and the story ends with her hitting Patrick with the lamb.
To do this I had to give her some background story whereby her father and then Patrick have led her to believe that only men can do something with their lives and women will always be confined to housework.

Now, I don't know how to trap him in the house to let her out because she can't hit him with the lamb twice and it's pointless if she leaves without trapping him because she may as well have done so ages ago and she needs the car which he always takes with him and has the keys for... and him having an affair seems irrelevant.

On another note, providing my story doesn't change drastically when I have managed to get my head around it, I have decided exactly how I will present my ideas (I just hope I can do it as it relies on my creativity and photoshop skills) and have been looking at actresses to play Mary. I considered Carey Mulligan before remembering she was English. I will update with these aspects later on.

For now... $*£&%!@