On a deeper level the mirror can be considered to be a representation of the intellect. The intellect is an instrument of navigation and is constantly persuading us to identify ourselves. When we think about this, it makes a lot of sense. We use this self-identity, which is greatly a production of our intellect, to navigate through life. The significance money has in your waking life is reflected in your dream state.
Money is a symbol of power and wealth.
We often judge ourselves based on our ability to make it, save it, and spend it. First consider your own relationship with money and your current financial situation as this dream could be simple wish-fulfillment. As always, consider all of the accompanying details in your dream because they will help you to understand where your issues lie. Traditional dream interpretations indicate that losing money in your dream is a good omen, and that probably the opposite will happen. Generally, money may represent those things that are most valuable to you and not necessarily cash.