Fera is not very strong in the One Power. Her level of strength is described by "The Wheel of Time Companion" as 33(21) which is a middle/low level in Aes Sedai hierarchy. With this level of strength she is unable to open alone a suitable gateway to Travel.
She was born in 864 NE, and went to the White Tower in 882 NE. She spent 13 years as a novice and 9 as Accepted.
Elza Penfell and Fera travel together from Tar Valon to Cairhien. They discover that they share a dark allegiance.
It is presumed that Fera, along with the other Black Ajah prisoners, was Compelled by Verin Mathwin to serve Rand and ensure that he doesn't die until the Last Battle. However, the Wheel of Time Companion reveals that Fera's oath to serve Rand was a lie, allowed by her Black Ajah affiliation and foreswearing of the Three Oaths. This would mean that Verin's compulsion failed; indeed, requirements for Verin's compulsion to work were that the subject trusted Verin and could find a reason within herself to follow Verin's orders. It would have been easy for Fera to overcome either of these conditions.