Vida's cousin was staying in her room Vida wanted the room to herself.

How should the run-on sentence above BEST be written?

Vida's cousin was staying in her room, Vida wanted the room to herself.
Vida's cousin, was staying in her room, but wanted the room to herself.
Vida's cousin was staying in her room, but Vida wanted the room to herself.
Vida's cousin was staying, in her room, but Vida, wanted the room to herself.