Why is Ahsoka Tano's fighting so different to other Jedi?

Ahsoka uses a way different style of holding her lightsaber and fighting compared to other Jedi. We all know that. But why is that?

Ahsoka was already as a Padawan extremely talented in combat and fighting. For someone her age at least. She always perfered holding her saber back hand, but Anakin made her practice the standard way of holding it too during the war. When she left the temple to be a Padawan, she was already fully capable of using Form 5, Even though she still had to work on it. Form 5 is known for a strong defense and blocking of lightsabers followed by a rapid and powerful strike as a counter. The Shien type of form fighting allowed her then to use the well known backhand grip. She also included Form 4 Elements in her fighting, which made her style of fighting faster, more agile and aggressive. She constructed a second lightsaber throughout the war. This allowed her to use Char Quai, which simply means the use of two lightsabers at the same time.

Overall it can be said that Ahsoka uses a Form 4/Form5 Char Quai style. Her fighting is complex, complicated and difficult to defend. This shows also later in her battles against the inquisitors and Darth Vader.