To be clear, these were suggested by you.
a) Grogginess only lasts a few moments for most IMO, even if being awoken in the middle of the night. Regardless of whatever situation you speculate, it makes no sense for NG to still be groggy by the time she arrives at the door, IMO.
b) it was the middle of the night; I seriously doubt NG was so confused she thought someone was there to take her to church - something that usually happened during the daytime. She had functioning eyes, as far as we know.
Alternatively, I seriously doubt she opened the door in the middle of the night to a stranger unless she thought it was related to her family’s safety. There is no reason to think she thought that was the case, IMHO.