Jolly, yes you should because getting insulted is her way of “getting her way”. And if you want to “keep” the friendship it has to work for both of you. It has to meet your needs as well as hers. YOU BOTH have to be respected in the relationship. It can’t be one sided because then it is NOT a relationship or a friendship, then it is an obligation. So in order to be friends and be happy with each other and the time you spend together you both have to be respected and both or your needs have to be met. Do you understand what I am saying?
You don’t have to straight out insult her, but you have to “coach” her into a normal relationship by asserting what you want as well. YOU simply have to say “Today I NEED to do….do you want to come?” and if she argues with you, you will have to learn how to say “then we will have to reschedule for another day because I really need to do this for myself”. Sooner or later she will catch on that she will have to play fair and that your needs count as well and that it is no longer going to be only about her. And when you stop her from interrupting you and actually make her wait until you finish your thoughts, she will also learn that YOU have something equally important to say. Having a conversation means that one person speaks while the other listens and then they change places.