Well the scenarios are considerably different if thy speak regularly or if they speak once a year, on her birthday. It makes a huge difference in assessing their current relationship.

With regard to the pictures: I imagine that she sent them as part of her ongoing relationship with that guy. She didn't think that much about it and probably forgot that she sent them and didn't think to take them down. I bet that she didn't mean to betray you, I bet she just forgot.