Ahsoka was never a Jedi, persay. She was a washed out padawan. Not her fault, but true. This also explained why Anakin was so angry at the council for not making him a master. He trained a padawan, and they made her quit.
No. That's not true, on at least two accounts.
First of all, the Jedi Council didn't make Ahsoka quit. On the contrary, they asked her to remain a Jedi. Ahsoka elected to quit, because she believed that the Jedi had lost faith in her and only belatedly regained it.
Secondly, she didn't wash out. Again, she had been asked by the leadership to remain. To be washed out means to be dismissed for failing to measure up to the expected standards. That does not describe Ahsoka's condition.