I think he should have pardoned her, but, oh well, this is better than nothing. Unfortunately, I think by doing this Obama is also sending a message to Snowden that had he been willing to face the music this would probably have been his fate as well. Though how could Snowden predict that given that Obama's administration was so aggressive toward whistleblowers in general. If Obama wouldn't pardon Manning I don't see him doing so for Snowden.
I hope Obama proves me wrong and does pardon Snowden.
Since Snowden is holed up in Russia, perhaps Trump will pardon him - even to spite Obama.
One can only hope. And then the rest of them too.