How to get rid of this horrid flatmate?

She sounds like a right,this forum does not allow this language,she is a good example why halls of residence should have house masters/mistress's as not all students can act reasonably,report her to the university authorities,she is infringing on your human right to have an education.Explain your anxiety,her immature attitude and indifference,how you are not getting the environment you expect to complete your educational targets,your health issues and will they offer you an acceptable alternative.Sod her,her feelings,friends feelings,you are your number one priority and the powers in your establishment owe you an obligation.Be positive,strong,press the points I have made,even print this out and show it to them.You deserve your rights and are right to demand them.Stay positive and firm,wish you well.