Make sure she is getting the same attention, I think you have hit the nail on the head and its jealousy..distraction may work and also get them playing a game together , take the focus away from you .
Yes, I'll try doing that. Also I think I'll pay more attention to her. Thanks
Thats good, when you are talking to the 7 year old bring the older child into the conversation, make her part of it.Maybe the 11year old brother is kind to her and talks to her .
I don't think you can force siblings to be friends, but you can make them be civil. If you want to encourage them to be nice to each other perhaps you can plan activities for the two of them. For instance have them cook together or go for a walk. Get a pet that they can care for together. It might take some time and effort, but I bet you can make it better. Perhaps you should ask your daughter's doctor/therapist for some ideas too.
You know that's one problem. She is non-verbal and likes to sit in her favourite corner near the window. But I think by making them play together and taking them for walks together, it might work. As skepticalpeach said, it will take a lot of time and effort. Hope something works. Thank you for the tips.
You are welcome , well introduce not force the issue , perhaps get them a drawing book each and have them draw something in the room ,its up to you to have them engage more with each other and speak to both of them its possible the older child has felt left out and isolated.good luck let us know if any of it works .