A year isn't all that long in the land of MLC. It can take years for her issues to be resolved or she may never resolve them and continue to walk this earth a very confused woman.
What happened approximately 18-24 months prior to her beginning to show signs of MLC/confusion? Something had to set her emotionally state into motion. MLC's main ingredient is depression. There will be days when she is sweet as pie and then she'll flip on a dime and want a divorce. That's the confusion talking. She is on an emotional rollercoaster and it can be very frustrating to the spouse because you never know what to expect at any given time.
As for the WAW family, treat them as you always have. I would advise not discussing the situation w/them because blood is thicker than water. They will need to see how their daughter is behaving before they will come to realize that you aren't the one driving the "divorce train".
They want a divorce and some will begin the progress and yet, not follow thru because it's a lot of work and they can't focus on it. Some will screen "divorce" to get the spouse to back off and leave them be. In some cases, the spouse will need to file to protect the assets and set child visitation schedules and support.
The best thing you can do is treat is as a roommate for now and keep the focus on you and your children. If she's in MLC, she will become the exact opposite of the woman you know and love, i.e., the mirror image. They return to the age where they were emotionally stunted and, hopefully, will grow up from that age, after many years.
For now, dig deeper for patience, read all you can about depression and MLC, and most importantly, take care of yourself. Keep the focus on you and your children. Leave her to figure things out for herself.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.
