Bridal shower invites

So I made my bridal shower invites with my mom online… The original plan was that my FMIL would make them for me, but ever since her sciatic nerve started acting up .. she told me that she wouldn’t be able to do them for me after all…. Then she said she might not be able to go to my bridal shower because of how bad her pain was… Let me also include that she will be getting back surgery 2 weeks before my bridal shower… So point of the story is, now my fmil is upset that I didn’t put her name on my bridal shower invites. I only put “RSVP (MOB) “my moms name”…. She asked my fiancé how come I didn’t add her name as well? I figured first of all she’s hurt badly and to be honest she’s been not much help in the first place for all the decor or anything. She’s also been extremely rude to my mom every time we would ask for help with ideas on things for the bridal shower. Am I in the wrong here? When I did the invites I figured she wouldn’t want to help anyways since she told us she can’t hardly do anything anyways because of her back pain… I meant nothing by it by not adding her name to the RSVP… As it is my mom is the only one doing all the decorations and planning and hiring venders for it while my fmil isn’t doing anything.
-Down & confused bride