Don't tell her you don't want her to be weak. Do things that show strength and leadership on YOUR part, and you will be suprised what she might follow after a few weeks.
I use C as my example. My W basically said no to C. I sought it on my own and didn't tell her at first. I don't remember how it came up, but she asked me how many times I had gone. I told her how many, and about two weeks later she said she was going to see a C.
Her C ended up recommending to her that we start MC.
