Oh hun I couldn't read this and not post i can't imagine the amount of stress you are under right now.

Although it may seem hard, I would definitely confront the in-laws, and explain (doesn't necessarily have to be in full detail, but enough they know whats happening) what your mum is really like and the reasons she's done this (according to her, then your version of events)
It will likely be awkward as anything, but they may surprise you with how understanding and supportive they are!

I would DEFINITELY be blocking her numbers from your and DH's phone now, and giving her warnings that of she doesn't back off that further action will be taken (dont have to say what, if you're not sure what you'd do, but it's the threat nonetheless)
Even after talking to the IL's, get them to block her number if they agree? I'm sure they wouldn't object to it seeing as they'd likely be gettin woken up at all hours of the night :/

I really hope things settle down Hun and sprout is born to a (relatively) stress-free mumma, and drama-free life


Sent from the mobile world of iPhones - while no doubt i should be elsewhere!