Maybe it is. Usually sellers wouldn't deny a snad dispute because it's a known fact that ebay is lopsided in favor of buyers.What’s the difference? Requesting a return with that reason is not SNAD? How do I do that?
I do see the difference in your picture. If you can include a picture indicating that the watery one is from her and the thicker is what it's supposed to look like, that might help. (I'm not sure whether you can add the picture.)