I'm going to yell at a drunk girl to get the fuck out of my campsite.
Do you really mean that? What will you do if she gets upset and refuses to go?
She ought to get upset, she shouldn't be drunk at my campsite.
If someone is in your space, it is reasonable that you would want them to leave. However, yelling at a drunk person is not going to get you anywhere; she won't be reasoned with in that state. Besides, yelling and swearing at people is rude.
I'm going to get them out of my campsite. If you don't like what I'm doing, go away. If you want to criticize me then do it on twitter, you are a horrible person.
All I am just trying to say is to try to be a little kinder to this person. I don't believe anyone deserves to be yelled at, especially if they might have mistakenly come to your area. How about just politely telling her she's in the wrong place, or maybe inviting her to come stay for a while?