*MAY* have answer to many questions now- 'KOBOLDS'
"In German (Teutonic) folklore, kobolds are spirits who dwell in mines and who like to torment humans. They are tricksters and not inherently evil. Like Robin Goodfellow, they may either help or harass humans, for unknown reasons. In the 16th and the 17th century, they were usually depicted on paintings as little devils with a conical hat, pointy shoes, a hairy tail, and bald feet instead of hands. In the class of fairy-like beings, they are considered to be the most dangerous and most ugly. Some sources suggest that kobolds are related to the Brownies "
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Okay, I'm pretty sure these critters are KOBOLDS. And I also think I can explain some things...why are these things after her? it must be that the creatures were disturbed or some possibly killed when the house was built; this would explain why they are after only her, because she is related to a previous owner...the only way to 'equalize' this is turn the humans into something like themselves...it also explains why they hate light, why there is a tunnel beneath the house, and why she tells them to be patient and wait for 'others'. I would love to have the writer explain this...just got through watching it after not seeing it in about 30 years....still VERY creepy.