i would say yes. im only 12 and i read it. it's really not that bad, S. Meyer did a really good job not making it..ur..um...slutty. for example the first time they do it S. Meyer shows bella getting ready. than she goes out to the ocean where edward is waiting, and than edwards all like "are you sure you want to do this" and bella says yes and edward said "if i hurt you at all you must tell me immediately" so on and so on. and than bella says ok and than bella says something about the moon. then it ends the chapter, the next chapter is after sex. like the morning after, and it's really not that bad, it took me like 5 pages to realize they were naked, that's how "censored" it was!
i really hope you let her read it because in my opinion it was the best book out of the entire sage!