I have that problem with one of mine too. She's look away, or turns her back to you as soon as the camera or phone come out. She's been doing it for so long, I have learned to become sneaky at taking pictures.
I have another one that has had a camera in her face since she was a baby, just a few months old. She's 7 yrs old now and I actually think she poses for the camera. I get the camera out, call for her, and here she comes, posing all the way. It's pretty funny.