http://instagram.com/legal/terms/#
Quote:
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You must not create or submit unwanted email, comments, likes or other forms of commercial or harassing communications (a/k/a "spam") to any Instagram users.
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May be technically against TOS if anybody complains, but you can give it a try. If you are exclusive with her content and your site shows up first in google, You may not even need to show your url in the image.