Wedding gift question--the 'list'

So my grandmother has been harrassing me to find out if one of our relatives who RSVPed yes and never bothered to show sent a gift...I keep forgetting to check...

So my mom reminded me before that my grandmother was asking...then my mom was like 'you made a list, right? I need you to print it out so I can have a copy.'

I was like 'uhhh...why do you need a copy??'

She was explaining that she needs to see for future reference so she can reciporicate gifts...but I can't even think of anyone that would be getting married that she would need to see...plus she can always just ask me.

I think I may have possibly hurt my mom's feelings by eventually saying no, but I don't really think it's any of her business for her to have my list. I would have told MIL the same thing if she had ever asked--it's for me and DH only. My mom asked how much we got total, which I told her, but to give her the list was too much IMO.

Anyone have something like this happen to them? If not, what would you have done in my position? Maybe I was wrong? I'm ok hearing that too