Actually, the older you are, the less you'll probably like it. .... It doesn't depend on age so much as it depends on maturity. If you think she shouldn't read it, maybe she shouldn't. If you think she's mature enough to handle it and understand it, then by all means, let her.
In United States, Hunger Games is rated suitable for children of ages 13 and above. However, the Common Sense Media outlines that children can begin reading and watching Hunger Games at the age 12 depending on their maturity.