She was mature at the time of consummation and married with consent so why do think it's wrong? Women in hotter climates attain puberty earlier.
Also if you read her biography you'll know she was an accomplished women and served Islam for decades after Prophet's death.
And also feminism is being discussed so I'll share this http://en.wikipedia.org/wiki/Battle_of_the_Camel .She commanded thousands of Muslims on battlefield.