I honestly think it depends, my mom threw my baby shower and she told me not to come early and help and told me I didnât need to stay to clean up either. But I donât think your MIL will get upset if you do, she may just tell you to not worry about it.
I was gonna do my own baby shower and then was told I shouldnât have to throw my own baby shower so my aunt did everything and just asked me how I wanted everything as far as food and the theme.
My baby shower was at my momâs house and we were having a joint baby shower with all family and friends (both genders included) so we showed up earlier to help set up (I couldnât help much being super pregnant and swollen but my husband helped a lot) and then we stayed later than everyone else to help clean up a little and then load up our car before going home