How to find social media content when you dont know the source of it?

Im not very familiar with content creation on social media, as im nto a content creator just a person who follows some social media pages but that is all I do. Also Im not a computer expert either or technology person. I want to know how a person can find information or content from a perticular topic when a person does not tag or put a hashtag on a video or photo like to guide the person to the source of that photo or video. For example there is a lady on IG that has a fan IG account of some celebrity. This lady when she post photos or videos of this celeb, she watermarks the photos with the name of her IG fan account in order to prevent other people to steal, share or copy her content, even if the photo or video she post on her account comes from other sources too. She sometimes erase the original legit watermark, place her own watermark and then post the photo on her account, that way she knows that if her watermarked photo is found outside the IG platform she knows her photo was stolen without permission.

Now since this lady does nto want her content to be seen in other accounts or be found she is wise enough not to put a hashtag # or even tag @ in her photos so people can't track the source of that photo or video she posts exclusively in her account. THis lady wants to have the exclusivity of what she posts before anyone else or before the content may be uploaded by someone else hours later, she wants to be the first one.

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So I want to know how can you track or find the original source of a photo when there is no tag or hashtag included in the photo, ike this lady does. Is there a way you can know how to do it? Im rally baffled at this lady, and I wonder how she can find photos or videos that noone else have, unless she works with someone who knows the tricks of social media and give this lady the information right away the information is posted on the web.
How to find social media content when you dont know the source of it?
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