Freeloaders

I am a usually a really helpful guy and im hardly ever mean to anybody but when somebody starts freeloading off of me when they have their own place to stay and they have their meals paid for but they still come to my house and eat my food a sleep over every night i start to get really aggravated. Being the nice guy that i am, i dont know how to tell this individual to stop. Dont get me wrong, we are friends but she's kinda wearing out her welcome. Sometimes i would like to just come home and relax with just me and my roommate with no company....but that can't happen with this paticular individual around. Shes loud, comes in when im trying to sleep and just turns on the tv...I have a studio apartment so its not like i can go somewhere else in the house its all one big room. I don't wanna be a total a** hole to her but if thats what i takes for her to go back to her dorm and to stop freeloading off of me then thats what has to be done. Please if you have any helpful advice drop me a comment! *peace* -Cody-