Now since Moriden can use the True Power, a limiting weave that would be undectable by those using Saiden or Saider would seem a better possibility.

 

Excellent point, I hadn't though of that.  It could be that Lanfear has be fitted with a partial shield similar to what she put on Asmo but made of the true power so she can't detect it.  Nice theory.

Except that a shield doesnt lower your strength, it just makes you unable to use your full strenght. And Demandred says that Mesaana or Semirhage (cant remember) says that Cyndane is weaker than Lanfear was, and we know that females can feel how strong someone else is with the power without them holding it.

The main argument i find thats against Lanfear/Cyndane being healed by a woman is that Siuan was one of the strongest Aes Sedai before she was stilled, bested only by Moiraine and Cadsuane i believe (maybe Elaida too). And when shes healed she is like what? Bottom 10 or something. And Cyndane is stronger then Moghedien and about the same strenght as Graendal. While Suian is going from top 3 among the Aes Sedai to the bottom 10, Lanfear goes from (probably) No.1 she is still among the top 10 of female channelers.