She is very short with gray hair. She is imposing. The ending of her surname suggests a Cairhienin origin. Judging by her appearance, it can be assumed that she has been Aes Sedai for a very long time.
Observing Jala's deference to the other sisters involved in Egwene al'Vere's capture it can be guessed that she is a middle or low-ranking Aes Sedai. So her level of strength in the One Power is not particularly high. However, the other sisters involved are quite strong, so there is a possibility that Jala is a high-ranking sister.
Jala and Merym galloped back to the Tower when they discovered who they have caught.