Ahsoka Tano May Still Be Alive

Okay, so Season 2 ended with Ahsoka thought to be killed by Darth Vadar. But maybe she survived? Force Spirits are blue, as seen in State Wars Episode 5 and 6 (both are movies). When we see Ahsoka walking into the Sith Temple, she is not blue, therefore not a Force Spirit. She could still be alive, living in the temple.