Can I ask my wife to find a new job?
Why do you want your wife working elsewhere?
I don't want her working on that project anymore.
You should do your best not to interfere with your partner's career. Giving advise is a good thing, just try not to overstep your boundaries. If you are just going off what she tells you then you are entitled to your own opinion.
I'm just saying what I think and she really needs to quit.
If she enjoys her job, then while you can tell her that you want her to find a new one, you shouldn't expect her to. You shouldn't really be interfering in your loved one's career, as you wouldn't like it if she told you what to do for a job.