My friend is getting kinda annoying?

Hey guys, I'm Liz. So me and my friend Tiffany are dying our hair together. At first it was just gunna be us, but my other friend, Laura is doing it now too. And she basically invited herself over. She does this with EVERYTHING. She ALWAYS has to be included and it's so annoying and I really wanted it to just be me and Tiffany. Don't get me wrong, I love Laura but she just annoys the crap outta me. What should I do???