Not inviting Step-MIL to baby shower..

I will be having a very small baby shower at home with maybe 10 of the closest women in my life. I love my MIL and can tolerate my step-MIL in small doses. The two of them don’t get along however. There was no drama at our wedding because there was enough people that they didn’t have to interact and my Step-MIL promised she wouldn’t start anything (like she did at my SIL’s wedding). Well she did try to make a fuss but my husband shut her down quick smart and told her he wasn’t interested in hearing that on his wedding day.

It won’t be pleasant to have my MIL and Step-MIL in the same room especially when it’s such small baby shower. I’m planning on just not inviting my Step-MIL to avoid any unnecessary drama and so I can enjoy my day. I was thinking I could either just keep everything quiet and not have any photos on social media or just say that my friends organised the shower and guest list and it was a surprise to me. Step-MIL will be pissed if she found out but I honestly don’t have the energy or care for drama. Am I being unfair?