What should i do??

It sounds like you are a good friend, kind and considerate. If I were you I would let her share my room. Two days is not going to hurt, it might even be fun. We are only young once and we should take advantage of it by sharing it with good friends as they are hard to come by. This is how memories are made. Enjoy your time with your friend and let her stay with you. Make her feel comfortable and not as if she is a burden.