Faolain is dark of complexion and has a round face and dark curly hair.
This is confirmed by the Wheel of Time Companion, which lists her strength as 17(5). She is strong enough to Travel.
In the White Tower Edit
She is seen earlier in the books as an Accepted and often serves as a messenger, sending for Egwene and Nynaeve al'Meara (whom she seems very cold towards) to the Amyrlin and greeting Min at the gates of Tar Valon when she arrives the second time.
She is allied with the Salidar Aes Sedai, most likely led to Salidar by Aes Sedai that fled, as there is no other way she could have received the encrypted "Sallie Daera" message if it were her alone.
Raised to Aes Sedai Edit
When Elayne Trakand and Nynaeve arrive in Salidar, she is there to "greet" them and takes Nicola Treehill and Areina Nermasiv to be tested for channeling ability. She is still hostile towards Nynaeve. While in Salidar she had been raised to something higher than an Accepted but not quite an Aes Sedai. When Egwene al'Vere is raised as Amyrlin her first decree is to raise Faolain to a full fledged Aes Sedai.
She pledges to Egwene an oath of fealty and will be one of the few Aes Sedai Egwene can trust. Because Faolain hasn't used the Oath Rod other Aes Sedai still do not regard her as a full sister.
She goes missing when Lelaine finds out about her spying for Egwene. Lelaine presses Faolain hard for information she may know and then places her in confinement.
Min has had a viewing of Faolain that "good things" will come to her.