In the "Ahsoka" series, Ahsoka Tano does not directly help Obi-Wan Kenobi remember who he is, as he is not a character that she interacts with in this particular narrative. The series primarily focuses on Ahsoka's own journey and her quest to confront her past and deal with the remnants of the Jedi Order.
If you're referring to any specific episodes or themes where memories and identity are explored, please clarify, as the "Ahsoka" series incorporates various elements of Star Wars lore that might engage with these themes indirectly. However, there is no direct connection in the series between Ahsoka and Obi-Wan's memory.