Easter Egg in S3E1

There is a woman with straight blonde hair (cant be Misty) following Shauna. Two quick shots show the back of someones head with a blonde woman's hairstyle, the first one in the restaurant after the funeral when Shauna looks off into the distance, and the second outside of her home when she leaves the tape that Callie finds. This is def the same person and the person who followed Shauna into the bathroom in E2. My theory is Melissa is still alive and for some reason none of the yellowjackets speak to/about her.