People moving I'm, but not adding to lease in WA state
My boyfriend, myself, and a friend of ours are moving in to an apartment in Washington State. Our friends girlfriend is moving back here, but she won't be here when we sign the lease. The apartments we're checking out said we cannot add someone to the lease after it is signed until after the first 12 month period is over. She doesn't want to be on the lease. So if we don't add her, would she still be able to move in, or would it be illegal for her to stay any longer then the 2 weeks per 2 month rule they have? Would she still have to apply if she's not on the lease, or would that not even matter?