I don't think this company has even 10% of equity allocated for all the other employees. No way it's that much. She's sacrificed her own health, the health of her child and her personal relationships for someone who's coerced a bunch of people who are to scared to talk to a lawyer into a bunch of labour law violations.
When I myself interview with startups and they try to sell me on their BS vision fantasies, I tell them that I'm not available 24/7. I'm not on call duty either and if they have issues with that I'm happy to use my experience to help them transform/automate their business into a situation where they are more efficient and don't need to burn out their employees. Some people respect this as a sign of experience and others, especially the valley considers this not aligning with their "values".
This is exploitation plain and simple. They cheat their employees into thinking taking abuse is acceptable, because that's what you have to do to change the world. If anything such people change the world for the worse if you ask me.
EDIT: also, due to the lack of experience it's clear that some of the directions actually come top down from whatever VC is involved in it.