Her Warder is Sleete.
Strength and Abilities Edit
Sleete mentioned that Hattori doesn't have much influence in the Tower, suggesting that she may be relatively weak in the One Power.
This is also stressed by the fact that Covarla Baldene obtained command in Dorlan because she was the strongest in that group of Aes Sedai and so Hattori level is surely beneath that of Covarla, who is not very strong.
In fact Covarla strength level is 21(9) which can be just enough to open alone suitable Gateways for Traveling, consequently can be supposed that Hattori is not able to open them for lacking of strength.
After the schism, she disliked the atmosphere in the White Tower and sought an excuse to leave. She joined Elaida's force set against Rand al'Thor, not knowing the depth of Elaida's order for him.
At the Battle of Dumai's Wells, she was separated from Sleete, and she returned to the Tower along with ten other sisters led by Covarla. They were joined by Katerine Alruddin and Tarna Feir later.
There, she reunited with Sleete, who was wounded during the battle and stayed away for a while to recover.