Why is it so difficult to disagree with my boss even when I am sure she is wrong?

Sometimes we have this mind set that they are our bosses and that we should respect their decisions. But it does not mean that they are always right. If you can come up with a reason and a back up as to why u think that your boss is wrong I suggest that you share your opinion with your boss and tell them that you will support them is the decision that they make but u also want to share your opinion and there is nothing wrong in doing so.

Because you feel she is superior to you, Because you feel you will be fired from your job, Because you feel she is holding all the power of authority. But sometimes it is best to agree even if she is wrong. (That depends upon the mentality of the boss) There is nothing as such she is superior than you. May be in the Office but in the outside we are all same humans who is craving for basic needs, there is a quote "No one is superior than you and no one is inferior than you" . But in the Corporate World no one has the guts to face the problem that will occur once we raised the voice against the wrong, and you can tell her she is wrong if it is, there is no harm in telling and if she is not taking it well its better to leave the company then to be a slave.

That is a normal part of our relationships at work. I find that talking through the concerns always helps. Ask her to explain her reasoning. Really listen to what she says. She may have different information or a different take on the topic at hand. When you respond to her tell her which of her points were accurate, and then tell her your perception on the topic. Open up a conversation that is built on respect and subject matter knowledge.

You are the expert on you. Some people may find it easier or harder to disagree with your boss. What are the challenges for you? When has disagreeing gone well? When has it gone poorly? Is there a way you can rephrase your disagreement to sound like an agreement with a twist? Some bosses do not take criticism well, and personally I do not believe they are good bosses if they can't. We cannot control what someone else says, does, thinks, or how they react, and it is not our responsibility or our fault if we are phrasing ourselves as logical, mature adults, and they react poorly, especially in a professional environment. You may have an HR rep you can discuss this with, a suggestion box, or your boss may have a boss you can reach out to. There may be federal bureaus you can reach out to if laws or rights are being broken at your employment. Otherwise, you may want to ask yourself: is it worth it for me to care about this company's success as much as I do given that my observations have gone unheeded?

Your boss has a sense of authority and power that makes it hard for you to disagree, and that's completely normal for someone with a lower position.