I also wanted to validate to you that your daughter is smart, regardless of her ssat score. I think people (kids especially) on CC put a lot of emphasis on the test scores.
Firstly, there is absolutely luck involved! Both my kids took it twice, both thought parts were much easier on one vs the other. Your daughter may have gotten a harder one. And yes, I know, the company is supposed to use averages, scores, etc to even it all out but we all know things like that do not work perfectly.
Secondly, from my son’s own experience, the perfect score kids are not always more capable students. He was kept out of honors geometry (I have a million posts about it because I was so annoyed 
after digging deeper, plus a parent teacher conference, it turns out that basically only the 99% math SSAT kids got honors. Now, after the fall semester exam, my son is being moved up and half of those kids are being moved down.
So your daughter could very well be able to do the work at a top school - the test is not everything! Good luck. 3/4 of the battle is the mental anguish all this creates.