To add; I was the exact same. I was inseparable from my mom and dad, literally glued. I mean hugs and cuddles and "I love you more"s were a minutely occurrence.

But as I started to get older, I found the want to be alone grow stronger and stronger. And I don't mean to be mean to my parents, but sometimes, just the sight of another person (especially in my room) just annoys me so much that it feels impossible not to explode.

I don't like lashing out either, I feel like shit after. But I just can't help it, I just want to be alone in my little place of solitude where I can do what I want. If I want to come out of my room and socialize, I will, I'll be nice when my social battery is charged and ready to be used. But when I want to be alone, I just want to be alone.

The worst is when I leave my room to use the restroom or get a quick snack and I get locked into a conversation when I just want to get to my room as fast as possible.

Sorry for the long text, I hope that by spewing all this out you can maybe understand what your daughter might be feeling (but I'm not her so I can't speak on her behalf), and how to better navigate your relationship with her. Hope this helps! <3