MIL mishaps

Sara
Ok so my husband wants to bring my MIL in the loop. He's deployed and I really wanted to wait for him to be here so we can tell her together. The backstory being is that when I had a ectopic had a surgery at the beginning of year because I was DYING she didn't care (actually his family didn't care) and instead began arguing with him about money. 
Is it unreasonable for me to want to wait? Right now I'm very blunt even downright mean if I feel threatened and if anything was said against my peanut I'll go ballistic