She knows the GOP-e despises her.
If she makes a big move to personally campaign for many Conservatives in 2014, then you will know she is testing the waters for a serious run in 2016.
Her strategy in 14 will be to mainly go after the GOP-e in order to push "real" Conservatives against the RINOs. If that effort is successful, then she will move early to run.
The GOP-E were too stupid and selfish to run Reagan the first time he made himself available, they sandbagged him for Ford and got Carter.
The GOP-E just sandbagged conservatives for Romney and got Obama, and Obama is worse than the third Carter administration.
This MAY (and only may) be what Sarah needs to secure the GOP nomination in spite of the E's, as it did for Reagan (just barely).
However we have a different electorate now, and Reagan did have his movie star goodwill, and his ability to speak directly to the people.
The left in America are substantially more evil now than when Reagan faced them.
Bottom line, I have absolute faith in Sarah Palin, what she does is what should be done.