I took my 14 year old daughter to see 127 hours and didn't have a problem with it. It's not exactly Straw dogs or The Texas Chainsaw Massacre. Its relativey true to the original book and remarkably well filmed in my opinion.
With respect to Sanctum, I'll happily sneek her in to see that too.She could do with a good laugh, from what I've seen so far on TV it looks like a fantastic comedy.