LOL. This is a funny image. I wonder, Lynne, did they joke about your wearing "Barbie" fins....
Well, actually, this is kind of pertinent to the OP's question. One of the two is my long-term, dearly beloved dive buddy, and I think we have some of the same dynamics issues that come up for spouses. I spent the better part of a week trying to get these guys to slow down so I didn't have to swim like a madwoman on the exits (they always made me lead, because I use less gas running the reel so we got to go further). Finally, we do a dive with another guy, and at the end of the dive he rips into my buddy for swimming off and leaving me (because the other guy stayed WITH me, instead of leaving) and THAT, my buddy heard, when he hadn't heard me complaining for a week.
Samson, cold water and low viz make life much harder. It's very easy to get turned around or disoriented in space, when you don't have much visual reference. Navigation is also a challenge, when you don't have a well-defined reef or wall to work your way along, or a group to follow. There are a lot of reasons why your wife might find diving here to be a challenge. The good news is that there are ways to work around all of it, ranging from using sites with good navigational structure, to some communications techniques that help keep dive teams together.
The most important thing is that your wife isn't put under pressure that's uncomfortable for her, or made to feel that she's somehow failing because she isn't living up your expectations. She needs whatever time she needs to get all this sorted out. There are some nice, easy local dive sites for practice, and I would suggest some shore diving at some of them, just to get the "finding the boat again" issue out of the picture. Sites like Cove 2 may not be exciting, but there are excellent maps available of the cove that you and she can use for orientation, and current is not an issue there, nor are surface water conditions a problem very often. The structures in the cove aren't arranged in any kind of logical order, but working on getting from one to another is good navigation practice for compass use, and for using natural navigation cues like depth contours.
Most critical is that it has to stay fun.