Ok hopefully I am not completely wrong but just to be safe.
My moh asked for a list for my bridal shower, simple enough. After some thought I didn't add my fbil's girlfriend for a variety of reasons. One mainly being it is out of state for her and fbil will be on bachlor party which falls on the same weekend. Is this a huge rude blunder on my part.
Side note- I have only met her twice and have never spoken more then ten words to her.