Handling housemates?

I'm sharing a house this year with three other girls. One of them dates a lot of guys, which is fine however she brings them round and they stay over and are in the kitchen in the morning or there when I come out of the shower. Personally my house is my space where I want to relax, not socialise, and I know 2 of the other girls I live with feel the same and equally don't like having random strangers in the house. This girl has apparently also invited round a ton of people, none of whom any of the rest of us know, and she didn't tell me. I don't even get any warning that half my uni will be in my living room. It's driving me nuts and I know that people are different and some use their house as a social space and some prefer it as a quiet space. I'm willing to compromise but some warning or at least waiting until she's been talking to a guy more than a week before he's staying round would be nice!
She doesn't seem to respect that it makes the rest of us uncomfortable despite us telling her. I feel horrible because I don't want to ruin her good time but personally it takes me so long to get comfortable around people (I'm only just comfortable with my housemates and I've known them for a year although not living with them) so having random people in my house stresses me out and sick of feeling uncomfortable going to have a shower in my own house. I don't know what to do about her.