Long story short I'm taking my DPs grandmother out to the cinema to see a movie we are both dying to see as a treat for her birthday. Mentioned this to MIL and MIL invited herself along, which I didn't mind, although I know she has no interest in seeing this movie.
Partners grandmother texted me and confirmed a date when I was in MILs house today. I told MIL the date and she hmm'd and haa'd about the date and whether or not it suited her. I told her it was fine if she would prefer to not go because I know she wasn't interested in the movie. Her response was "Yea I know, but I just feel like it would be weird if it was just the two of you and not anyone from the family". For context, this is not her mother, this is DPs paternal grandmother. DP and I have been together for 7.5 years, we're engaged to be married next year, and we have a child together. I feel so hurt by her comment and I'm not sure how to deal with it. Any recommendations?