Yes, MIL will undoubtedly tell W, and how! MIL will blow a gasket and step up her pace to have me ousted for good.
MIL has tried to pass herself off in the last year or so as being a "happy" person -- it's all show. W now tries to cover for MIL too in that regard, by trying to convince me that MIL is doing a good job raising our S's while she goes off to do whatever.
I had a very informative discussion with MIL the week before I moved out. I let her do all the talking -- giving her all the rope she needed to hang herself. She smugly tried to lecture me about marriage and what I had done so horribly wrong to screw everything up. She excused her daughter's feelings and tried to calmly tell me that I should accept her decisions. MIL gave me her spiel about how she thinks a marriage should be, and how a husband should be willing to come home after a hard day's of work and relieve the wife of any household duties, out of "love and kindness." She thinks a husband should bow and scrape and do anything it takes to show his wife how much he loves her. I kid you not.
The whole time I'm listening to MIL fully lay out her warped sense of marital bliss, I am thinking that this woman is off her rocker. I bit my tongue so hard that I might allow her to continue this blather to completion. Afterwards, I knew where I stood in her eyes -- and that MIL was (is) an accessory to the crime against my family.