Should I help my wife with her academic paper when she didn't even mention me in her acknowledgement in her thesis where I helped her with the entire statistics?

In my wife's defence, she had copied the acknowledgement section from her postgraduate batchmate, and my name escaped her mind completely. I had helped her in the entire statistics process, staying up late night after day long shifts doing statistical analysis. Meanwhile in my post graduation thesis, I had mentioned her for being there for mental support even when she had no contribution at all. I am not a statistician, just happen to know the basics, and my wife can probably get around without my help. Now my wife wants me to help her with academic publications. I shall not be credited as co-author, and last time she did not acknowledge it, although her seniors and batchmates were mentioned, none of whom helped her. Am I in wrong refusing to help this time because I think she has been ungrateful?