Thank you for the bird's nest.

You take some close-ups of bird's nest sent by your sister in your WeChat circle of friends, and then write a thank-you note for the bird's nest sent by your sister. If this doesn't work, you can forward it to QQ group, and others can see it in other places. Then you can send a photo of bird's nest to the group and say some words of thanks to express your gratitude for the bird's nest sent by your sister!