I believe there is a chance she will come alone. For the fact that she knew for 2 years that it was important to you and never brought it up means she is concern about your feelings.
When I met my wife several years ago I knew she was anti-gun so I never brought out the possibility of acquiring one. But two months after we got married, I told her I was thinking about getting a firearm for home protection. During our dating phase, we will read articles about gun related violence on innocent people. We would also read the crime report about our area.
I also knew she was a very reasonable person and her anti-gun nature was a result of her upbringing and lack of knowledge about firearms. You should know her well enough to find ways and ease her fears. I asked my wife these series of questions
1. What if we hear somebody breaking in our house at night?
Possible answer, call the cops. I showed her the response rate of cops to crime scene. I told her that I have no doubt the cops will show up, but it will be after we have been victimize. If we survive, we will file a report if not then we have ourselves to be blamed.
2. I asked her how much she valued her life and whether it was worth protecting? Whose responsibility was it? Should I outsource her safety to the police department?
I told her that I value our lives so much that I'm willing to make it the outmost priority. She looked at me and said, I'm still nervous but I trust your decisions. We went and purchase our first firearm together within a month after our discussion. We went to range and she was surprise how well she did. Now we have 4 within three years and she loves her Sally (Gen 4 Glock 19)
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Don't lose hope she will come along. But your approach will make the difference.
Sometimes in relationship you have to use the act of persuasion in order for the other person to buy into your ideas or decisions. Good luck.