NOT selfish. As they tell you on airplanes, always put your mask on first. You can't help anyone else if you have nothing to give. Your first priority should be yourself. ( This is from someone who has never put herself first.) Please never feel guilty about treating yourself.

The fact she's publicly disrespect you and jump to abuse the first time her needs aren't met (disregarding yours) is a bad sign. You do need to care for yourself. The anger of selfish people at being 'twarted' is no more advanced than that of a two year old. 'All about me' and not even recognising cleverer ways to still get what they want. I hope you feel a difference soon and your depression lifts.

Do what you need to do. You have to set boundaries sometimes, in order to protect your mental health and also command the respect you deserve. Never feel guilty for that. Good luck!

Lack of professionalism n her part to disrespect you in front of students