Sometimes we let our fears get in the way of our actions, and put a lot of pressure on the ones we love to be comfortable with them. When we push to hard, we actually get the opposite effect we want, and make them uncomfortable with our demands.
Learning to work slowly is a skill that brings out patience in us toward those close to us, and also gives them the time to process the information we are trying to convey to them, as when they are comfortable with what we do, they can also understand why we do, what we do. The reverse is also true as being patient is also how you become comfortable with them, and can process the information you receive, and understand it better.
The mistake we all make is trying to get what we want, without regard to the feelings of others and with committed partners, that's is a cause for conflict, and misunderstanding.
There is no hurry, so take the time to be comfortable with each other thru communications, and work together to resolve your issues, thru patience and understanding.
I don't think your wife is naïve at all, I just think she enjoys her friendship. I also think she would be totally crushed if she didn't have that friend, but will slowly see for herself the needs for boundaries that you both set, for you both.
Whew, fingers are tired, and didn't really mean to rail on, but just trying to help.