IMHO, I've seen it work both ways. I've seen the LBS detach and separate from the WAS and have the WAS both come back and also some thought they liked being single and free and hooked up with someone else.
The biggest thing that happens when a WAS decides to come back is exactly that. They make a conscience choice. They make the choice to do whatever it takes to work on the M. Fear of losing the LBS may open the door but it's not enough to sustain the relationship in the long run.
You are going to have to see how it feels in your sitch. The fact that your W told you honestly how she felt is a big thing. It shows that she's actually searching for an answer for why she feels so empty inside. The problem is that she's constantly looking for EXTERNAL things to make her feel whole when in reality, SHE herself is the only one that can fill that void. It's a choice. If she actually stopped and turned around to see you and your family and actually appreciated what she has, she will see that her life is very rich. But she's still looking elsewhere.
M-43 W-40 2D - 9 and 5
Emotion, yet peace. Ignorance, yet knowledge. Passion, yet serenity. Chaos, yet harmony. Death, yet a new life.