It is normal to hallucinate while falling asleep or waking up. You can hear different sounds, my partner also once experienced calling for help while he didn't actually do that. You can also still be paralyzed during this and feel that, sometimes it can feel like you can't breath.

Night terrors can occur in adults, but it's not just nightmares or being scared when you wake up and hallucinate (which is fairly common when that happens). If she's really having night terrors, it can be a sign of a number of things and you should take her to a doctor if it occurs regularly.