But if you're doing that to capture memories (hint: call it that, not just 'taking pictures') of her child(ren), the tolerance level goes way, way up.
I'd like to suggest that Neuro's concept can be extended generally. If you can present the photography as being to her benefit, you will gain tolerance. Some want a chance to show off the trip to friends; others might want a lovely print of themselves for the office wall. You know those parts of a long flight where you're too tired to do anything useful but can't fall asleep? Use those bits to think up ways to make images she'd like to have. It helps if you remember the conversations where she told you about telling her friends about the trip, and which friends those were.....You do remember, don't you?