MIL vent

JTJKH
I have 2 MIL's. My hubs bio mom is great she has stayed in touch w/me all through my preg., surgeries, treats my kids great! The step MIL she's a different story. She is constantly criticizing my parenting saying things like "if I let my 3 year old watch certain movies in gonna come home to my son tied up by her with a knife to his throat" has only texted me once thru my preg. About the baby (their 1st grandson) complained when they weren't called about me having emergency surgery. She posts stuff on fb almost daily about how wonderful, amazing, parents their daughter is to their two granddaughters and their so proud of my hubs sister & her husband for raising such great kids. 
I am getting induced April 1st we haven't told anyone yet & part of me doesn't want to tell them bc I'm so sick of them always having something to say about me & how I parent my kids mind you I have great kids too. I'm a SAHM mom I do everything w/my kids, teach them everything, care for them etc. 
would I be a total bitch if we didn't tell step MIL but we tell Bio MIL about induction?