RW, you are correct. Unfortunately there is nothing you can do to stop your W from moving out at any time, whether now, May 1, or at some later date.
Her wanting to move out is likely, at least in part, to be due to pressure she feels. Understand, it may not be (just) YOU that she is feeling pressure as the home itself may provide reminders to her of a life that she feels she can not be happy, in. Sometimes, the journey of Transition / MLC requires physical changes via travel or moving.
Rather than focusing on whether your W is going to move out or not, focus on GAL. Which will keep you occupied and out of her way, which may help her feel less pressure. It's all you can do.
Yes, validation is an act of acknowledging some else' feelings as valid, without judgement. Also, once validated, the person validating should not dwell on the subject. Validate and let it go.
