My mom's best friend annoys me 😑

So my mom has this really good friend. She's become a family friend and my mom's roommate. Well ever since she moved in with my mom we can't do anything without her making us feel guilty for not inviting her. Birthdays, dinners, days out etc. I feel like I can't plan anything with just my family because she runs to my mom right away telling her she's offended and so on because she wasn't invited. She goes everywhere my mom goes. She's like a tail on a dog. I'm planning a very small family only intimate wedding in a few months and she's already saying "we're gonna go here and do this after right?" and having an input on the day of my wedding when I was planning on only family. We're getting married on the beach. It's 10 people or less small. I'm just worried now if I tell my mom she's not invited she's going to throw a pity party and I'm going to HAVE to invite her. It's so fucking annoying. My brothers even told my mom "is she glued to your ass mom?" I could be sitting there talking about a movie with my mom and her friend will chime in "it was boring to us, we didn't like it" like she's speaking for my mom as well and it's really weird sometimes.