It is your account right, not hers? She doesn't contribute to it? If she has the password, she can do far more than just look at it.
Your wife was upset and based upon the last time will likely be upset if you change the password, because it is controlling? It is NOT controlling, you did it or you're doing it because you don't trust her.
It is a matter of trust not control, and right now, is she worthy of trust? Is she seeking to be trustworthy?
If no, then you have your answer.
Will it upset her? Well, she'll get upset, her choice.
It will be something she'll have to get over, and you're going to hear about it. It will be an issue when you guys talk.
Experience is a brutal teacher, but you learn. My God, do you learn. - C.S. Lewis
Life is usually all about how you handle Plan B. - Jack3Beans
Listen without defending; Speak without offending - FaithinAK