change of behaviour

It is not unusual for a child to behave so. The thoughts probably that she is no longer loved and needed in this house and her place has been taken away by her sibling. Her sibling has become more important and special to my parents as he is getting all the attention. You need to prove her wrong by showering your love on her in this difficult phase of her life when she feels everything has changed including her parents love for her. Let her know every now and then that she is still a very special person in your life and your life is incomplete without her. Make sure you spend quite a good time teaching her, dressing her up, feeding her. Hug her often and make her feel special. Let her feel nothing has changed. Take help of her father to take care of your little one. Talk to her once she is back from school, ask her how her day was, feed her with your own hands ,spend quality time with her on weekends . She probably needs overt expression of love for that reassurance. hope this helps! Here is a blog you might find useful. Blogs- https://www.parentune.com/parent-blog/how-to-mentally-prepare-your-child-for-a-sibling/3368