*This website DOES NOT constitute treatment and only provides information and advice in a Q&A format. For treatment (therapy and/or medications) you must go to a licensed professional in your area. Please note that anything said here is not private or confidential, as this is a public forum.
Hello and thank you for using JustAnswer. May I ask, what is your specific mental health question that you would like an answer to in regards ***** ***** situation?
I cannot tell you why she is acting in this manner since I have never spoken with her nor can I read her mind. In all honesty the why does not matter much because the fact is she is treating you poorly and her reasons why will not change how she has been treating you. Instead I would recommend not talking to your sister at all because she treats you so poorly and causes you this much distress. Your sister could have a mental health disorder or is just purposefully treating you this way because she wants to be mean and callous to you, either way it does not matter as you have to distance yourself from her if you want to get any sense of peace.
Please let me know if you have any other questions or concerns as I would be happy to continue assisting you regarding this issue.