There is a lot of anger and disbelief out there over this result, but I don't share it. Here's why.
The prosecution appears to have both overcharged her and put on a very weak case. They charged her with first degree homicide, ie murder with premeditated intent. They had zero evidence to support this theory. Clearly, it was included to try to coerce a plea bargain. Inexplicably, they didn't drop this charge before trial. The utter lack of evidence supporting it and the sheer improbability of it tainted the entire prosecution case, in my view. Yes, there were lesser included charges, eg manslughter, but once the jury realized there was no evidence to support the main charge, they probably looked more critically at the other charges as well.
Secondly, even if this case was a miscarriage of justice, I think the opposite happens far more often. I have followed a couple of domestic homicide cases in North Carolina recently where husbands were convicted on very little evidence. In one, the wife went out for a morning jog and never returned. Husband was charged and convicted, even though there was no evidence he had done it and a plausible alternative, eg someone grabbed her while she was jogging.
Most jury members are predisposed to believe that the police and prosecutors only bring cases where they are sure the defendant is guilty. In fact, many prosecutors are only interested in getting a conviction, particularly if it is a case with political overtones. They pick the person who they think they can get a jury to convict and build a case against them, rather than trying to determine what actually happened. Case in poiint, the Duke lacross case.