If you’re going to leave the job, please talk to your daughters as soon as possible. A friend of mine went through this. Her mother quit before my friend could apply for financial aid and she ended up with more debt than she otherwise would have. Early enough she’d have been able to get aid.
Many years later, it’s still a very big sore spot in her relationship with her mother. I’m not saying you need to stay in the job if that’s untenable. I’m just hoping you can plan ahead to minimize the impact if your daughters are relying on free/reduced tuition.