or at the very least be very rude to her when she rings up again 
She pissed me off last week taking DD away for a few days when she knew I didn't want to be seperated from her, as I was already overdue for DC3. But she disregarded how I felt and arranged it with DH and TBH DD did have a lovely time, however I spent days worried about what was going to happen if I went into labour with DD so far away from home. I now it is 99% being hormonal but still.
Since DD has been home, she is ringing daily for news...which is bad enough. However if we do not answer the phone quick enough or if we are out of the house, MIL rings MY parents to worry them about our 'missing status' 
Bearing in mind we are talking about a house with two children and two adults, we do not need monitoring.
Today We wanted to go swimming so I inisted that DH text MIL explaining that we were leaving the house WITHOUT phones, no the baby was not here and we would ring if anything changed.
She STILL BLOODY RANG UP just to bloody check if the baby was here. Can the BLOODY woman not take a BLOODY hint.
I know murder is out, but how unreasonable would I be to point out that my mother and friends manage not to ring me every day and certainly not bothering my parents. 
Just stopping ringing us.
Oh, DH thinks MIL is being reasonable. 