That is pretty tasteless.
If I had the chance to visit Sylvia's grave, I wouldn't be taking pictures of me at it, I'd just be taking a single picture of the grave, and leave flowers and that.
It's really disrespectful to the deceased when you photograph yourself at their grave looking like a tourist who just went to Mt. Rushmore or something.
I find Sylvia's story incredibly sad, so I wouldn't take delight in showing myself in any of the photos.