Ok, my guess is that you guys are young.
It is my my experience that the biggest complaint of a young woman in a relationship is that the guy doesnt pay enough attention to her, tied with he is not romantic. If you love each other, and are in a commited relationship, then yes.... you fvcked up big time but making a decision that directly affected her life without discussing it with her first. That is not only an ego buster for her, but is really disrespectful of you. That is not high maintenience, it is wanting to be treated like she matters.
Where you go from here...???
Well, you reversed your decision. That should show her something... like you may have fvcked up, but are not a bad hearted guy. She will probably need to sulk a bit more and punish you a bit longer, but if you are delicate and caring, she should come around.
Talk to her, ask her to tell you specifically what it is that she wants. Tell her that you need her to give you examples and details of what she wants... if she replies with something like 'if you love me, i wouldnt have to tell you"... well, that is kinda immature and not fair. After all, you are not a mind reader, not born with the instincts of a woman and that you are more than willing to give it a serious go, but she needs to be open, honest and fair in telling you what she wants.
Expecting you to know what she wants is like expecting a cat to be a dog... which is pretty much how men and women look at things... one cat, one dog both wondering why the other doesnt know how to behave like each other.
Good Luck!
