Don, don't worry too much - every single one of us does the wrong thing at first because it makes sense. I too did the "happy photos together" thing to find that made things worse. It's like pouring water on a fire, only to watch it explode.
We're appealing to a logical person, and your W isn't being logical right now. It sounds like she's got no idea what she wants.
However IMH and often wrong O, it sounds like things are pretty hopeful if she's vacillating on her feelings for you.
I'd read and reread Sandi's reflections, and of course everything that Cadet posted. The DR should be your handbook.
Also - Cadet is right about the gift of time. I have no such gift, and am watching my M slip through my fingers as the California divorce courts are a bullet train to dissolutionville. You're still together, you're communicating and the W isn't really sure what she wants.
It sounds to me as if you're here at the perfect time (or as perfect as it can get), and with some hard work you could build the foundation for a marriage that will last.
Me: 58 Her: 59 Kids: 0 Dog: 1 ILYBINILWY: 9/15 D Bomb: 1/11/16 (found out filed) Verified OM: 1/11/16 Moved out: 1/11/16 (thought it was temporary)