Honestly, it's a red flag to me what she said to you about her expectations of you spending every night with her. She acted and is behaving slighted, when what you needed to do was perfectly reasonable. She is being unreasonable, her expectations are unreasonable and come across as very demanding of you and not understanding or having respect and compassion for your needs with your mother. She is ignoring your needs, and is thinking only of her own needs, and that's a red flag. This is selfish behavior and is a self absorbed way of thinking. Is she like that in other ways, or is this the first you are seeing this type of selfishly driven behavior? Think on that.