Keep the conversations real simple: "Nice weather we're having. . . . You looked great in that new dress." Don't share your problems with her. Don't explain. You probably are starting to have a fair idea of what topics she gets nasty about. Keep the conversation superficial and you won't get hurt.

It sounds like you are seeking understanding from her. Don't bother. She wants to frustrate you. Stop giving her the opportunity.

It's sad for it to come to this between sisters, but it is what it is.