Re: Not coping with the new sensei
Your sensei should appreciate your presence in her dojo; if she is spiritually unhealthy and can lose her temper for issues outside of the aiki-topic, then she should read more and practise more. Buy her a good present, a book on the philosophy of Aikido (I'd recommend Transparent Power by Yukiyoshi Sagawa) so that she can develop into a better sense. That will be your step inwards.
Be a change agent. Make her respect your and all the other students' rights, bolstering your position with O'sensei's words: "Aikido is true democracy" - which implies that oppression or disrespect towards each other is not acceptable.
If you don't succeed to redirect her aggression, go away - think tenkan.