People don't separate with the intentions of saving or working on their marriage. They separate with the intentions of getting a Divorce and if during that period it doesn't work out for them then they might return. They also don't move out with 3 small kids either. What woman in their right mind, that wants to save their marriage does this????? None that I can think of.
The only thing she is trying to do is to extricate herself from the situation with least amount of guilt and drama as possible.