Disagreement with mom

Kind of a rant but I would love some neutral perspectives. So a little backstory...before we made our final guest list we knew we could only have 60 people max, we originally had around 80 people on our list so we knew we were going to have to make tough cuts. My mom paid our venue deposit but other than that my FH and I are paying for everything else. So since she had contributed money towards our wedding I decided to add her sisters (my aunts) to the list even though I have not seen them in probably at least 10 years and don’t talk to them on a regular basis at all. I had told her I didn’t really want to invite them cause we are not close and it felt weird to me cause I feel like I don’t really even know them except for one of them and 2 of my cousins but then I didn’t want others to feel left out and that if that’s what she really wanted then fine but I wasn’t going to invite any cousins for the same reason of someone feeling left out and I also told her that if she knew they for sure weren’t going to end up coming to let me know so I could ask other people that we wanted there... well we just sent out our save the dates and I sent them to all my aunts and then get a call today from my mom asking if one of my aunts, daughters can come and if my aunt could have a plus one cause she’s dating someone (never met him) and I told her no and she was just kind of like why not family should be before your friends She knows our max count is 60 and she also knows that we have a backup list for when we actually send out our real invites for if someone declines which I had told her if someone declines then I’ll invite my two cousins but for now it’s a no I just don’t have the room. Im very appreciative of my mom helping but she is really just starting to constantly stress me out and I don’t know if I’m over reacting or what? I honestly tried to handle it the best I could by inviting just her sisters even though it wasn’t what I really wanted but now she is acting like I should be giving them plus ones instead of our friends. So any advice or anything is very much appreciated.