I had a one-centimeter liver tumor imaged by CT scan in June of last year shortly after cholangiocarcinoma was diagnosed in both my intrahepatic ducts via ERCP brushings. I was told that this is considered "small," but that size really doesn't matter. [Where have I heard that before?] The cancer cells in the ducts were what mattered, since they were going to metasticize elsewhere, and quickly. The tumor might, too, but my docs weren't nearly as concerned about it as they were about what was found in the ERCP brushings.
I wasn't a candidate for surgical resection like your wife since both of my ducts were involved. However, due to the small size of the tumor and the lack of mets anywhere else, I was a candidate for orthotopic liver transplant, which I received 8 months ago yesterday. All of the CT scans that I've had subsequently including one about a month ago have been negative for cancer. Have your wife's doctors discussed doing any chemo/radiation prior to surgery? I had a five-week course prior to mine, as it is required before transplant. If your wife's surgery is only two weeks away, then maybe there'd be no benefit to it, but if there's going to be any significant delay then I would think they'd want to do something to keep the cancer at bay in the interim.
Best wishes to you and your wife.