I am really sorry to hear about your problems. I had a similar problem with my ex-wife, in terms of trying to convince her to seek help.ee
In her case violence was not an issue, but she was suffering from depression and alcoholism.
I tried for years to convince her to seek help.
In the end I just gave up and divorced her - she only went to treatment at that point.
It was good for her to go since she got her alcohol problem solved, but way too late for our relationship.
Based on my personal experience, if I have to deal with anything like this next time around my strategy will be to bail out as fast as I can, since I don't believe it is worth try to fix such a bit issue, life is too short and we need to move on.
This is just my 2 cents - sorry if I'm sounding too negative, but wanted to tell you about my experience.
(After the above experience I remarried, my new wife is Chinese (my ex was not). That's what attracted me to this forum, reading about other people's experiences with Chinese fiancees and wives. I know this is off-topic, but since this is my first post I thought I'll say it here anyways - I like a lot the topics on this forum!).