I doubt it. The call had a legitimate purpose and assuming the graduation was open to the public or she had a ticket she could take pictures of anyone she wanted to just like every other person with a camera.
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Seems unlikely based on your post. Call law enforcement for the absolute answer.
In no way am I offering you legal advice, and in no way has my comment created an attorney-client relationship. You are not to rely upon my note above in any way, but insted need to sit down with counsel and share all relevant facts before receiving fully-informed legal advice. If you want to be completely sure of your rights, you must sit down with an experienced criminal defense attorney to be fully aware of your rights.