I am traveling Guilin with my Husband and 08 years old kid to China in 2015.

Don't worry.
There are several Indian restaurants in this city.
Gangal Impression Indian Restaurant is highly recommended. You can find authentic and nice indian dishes there. It's located at No.100B, Sunshine Building 100D, Yangshuo Town, Diecui Road.

Or you can go to Kali Mirch (Black Pepper) Indian Cuisine. It also wins high popularity among local people and tourists. The address is Room 108B, Sunshine Building 100D, West Street, Yangshuo Town.

Hope you like.