Changes in the behavior of Chocolate

Chocolate is a very timid girl. She has been living with us for more than a year, but has not approached anyone else, except me. In the last month her behavior has changed significantly. Now she has "smiling days." On such days, she literally does not give me a pass! Wherever I go, she tries to hold me. At the same time it is impossible to be angry with her, because she does it with a smile :) This is a real smile :) Before that, only one of our dogs could smile like that. She stretches her lips and shows her teeth. Today she was smiling for the first time to my husband. I am glad that gradually she began to forget all her troubles and the betrayal of people. Of course, it will take a lot of effort to socialize her, but I hope that we will succeed.