Ahhh Yin,
For a moment there I was wondering if you were channelling the voice of Raymond. 
Let's see how it goes before we decide that it won't be equal? 
AAA
No,MY pet peeve is these type of cases. Inevtiably some TV pundits prattle on and on about how lucky the boy is and so on. If it IS a serious crime to have sex with underage kids (which it certainly IS) then the law SHOULD be applied equally. I would wager that it will not be that way in this case. I woud say that she will get a year tops,most likely less.
If it were a male....he would get numerous years.