If Edith were a weakling you'd have a chance this way, but she isn't.

She's got a lot of your determination, father, and with what's going on inside of her she'll beat you.

You can't keep her from seeing him, as long as she feels about him the way she does now.

You can't make her think less of him, either.
Nobody can.

Your only chance is that she'll do it for herself, and if you give her time and go easy she probably will.