I agree with Parlabane. Your daughter seems very well rounded, and being a legacy may increase her chances a bit. Don't worry too, too much about the SSATs, I have met kids with scores in 70th percentile at HADES. However, that's the exception, not the rule. If she can get her score up at least into around the 80th percentile, that'd be good. In my opinion, SSATs don't really matter much, they're just sort of a "cutoff" to make sure the kid can do the work. Essays and interviews matter a lot, so hopefully she'll ace them.
She has a chance, good luck!