Perhaps, if she felt forced to do this as a way to show the Forsaken she was serious about doing anything if it meant proving herself to them and showing them that she was willing to go to any length to understand what they went through, so that she could empathize and be a good ruler I could see her telling herself she only had to do it once.
Her body is also apparently being maintained by the Light which may present an interesting twist in terms of a choice of hers on how to maintain her body. If it's painful on a regular basis to enforce and perpetuate the Lightforging, after many years and years of pain she may consider eventually throwing aside her morals to avoid the pain if even for a little while. This kind of spiral could potentially be dangerous for her if she kept falling victim to the addiction of trying to stop the pain, especially if the Forsaken ever came around to idealizing her as they once did.