Everyone is different in regards to how their port actually looks...but if it's any consolation, even when I show people where mine is, if not for the still healing scar, people can't see it and can't tell. If i wore snug fitting clothing, nobody would be able to see it still, my surgeon did a really good job.
So I hope it's the same for your wife, that the port is barely visible and it's not a big issue for her. Best of luck to her...and as a side note, I am really glad I have a port as opposed to having my veins poked and prodded multiple times every time I need an IV started. It's nice not to have to stress about it or deal with the pain of multiple sticks...I just get it started into the port and then I don't need to worry about it.