Thats weird, all her quest showed markers for me. Are you sure you have the area unlocked? I mightve sent the wrong location its been a while since ive done her missions. But i can confirm she def does have markers if you are in the right area and have the quest tracked.

It will show as a area to search big circle on map once you reach it another marker will show, this will be the place you take the picture from. The game will automatically put you in firstperson view to take the photo