I don't know how religious you are or how you're going to take this but it sounds like demonic spirits. If I were you I would find someone who knows how to pray over her
I think these are two different things, moonkeeper.
I agree with your initial thought that she is having night terrors - which is a sleep disorder where the child is "in between" sleep and wakefulness. This usually happens in the early part of the night - so if the child goes to bed at 8, you will usually see it around 10 - 11 o'clock. It's not always caused by trauma, and tends to run in families where sleepwalking is also seen, or other sleep disturbances.
The daytime staring sounds exactly like "absence epilepsy", or petit mal seizures. Google it and see if you agree.
Oh wait, I just reread. You said the staring lasts 10-15 minutes. Are you sure it's that long? That's a REALLY long time to stare motionless. Have you timed them?
Petit mal seizures last under a minute.
I have timed them and usually they last 7-10 minutes more recently, 5-7. It only happens if she is really tired or upset I've noticed. I have an appointment with her doctor to have it checked out.As sometimes when she comes to she says ouch holding herself. Making me think a form of seizures.
Do you have a way to video these episodes? I think a doctor would be very interested in witnessing one.
I have a camera on my phone but that's it. I'm just hoping that I can figure out what is going on.