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How to confront a friend who keeps on stealing my photography?

We became friends at workplace two weeks ago (both of us joined then). Everything was fine and we started following each other on Instagram. Now, my passion is photography (nature, landscape, street). I sometimes use watermark and sometimes don't. After a few days she started asking me to send her photos that I was clicking and I sent some of them. Next day I saw a video that she has posted making a collaboration of those photos and of course she didn't mention me. The comments were full of praise. Next day she again asked for a photo and I didn't respond. She took a screenshot and posted it. Even shamelessly told me that she has had people jumping on her dms to tell her that she was cool. I personally have a small circle, I was never even complimented the half of that for my skills. It's bothering me. I don't want to ruin things but I want her to stop doing it. What's the right way?

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10 mo
By "send her photos that I was clicking" I meant the trees, flowers and animals I was photographing.
How to confront a friend who keeps on stealing my photography?
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