HELP!!! N64 players, Perfect Dark videogame questions?

I'm playing with my sis "perfect dark", so you know it's co-op, we're in level "area 51 -rescue" and we're already aware that the co-op version is different from the one player version. We can't get past the changing clothes thing. When we change our clothes only my sister can go in (which I'm ok with that) but someone is supposed to wait on her at the end of the room but no one is. We've tried this in thousands of different ways but still can't pass this level! help please! anybody?