Black Shadow Ghost Picture

Tiffeny Hardie sent us this ghost pic of a black shadow behind the kids. We believe it is a cell phone picture but could not find evidence of tampering with an app to create such a ghostly anomaly. Take a look...

"I was at my little cousin's birthday (party) when my mom took this pic. (When) I went to print it, I looked at it and saw the black shadow."

We see evidence of the object moving behind the girl to the right and directly below the anomaly. However, we also see a slight shadow of the anomaly, past the curtain and over the wall to the right.

Looking at this closer, the black mass looks to us like a cat looking out the slats of the window (perhaps at birds?). Could this be why the slats of the window blind are messed up. If it were a black cat, could it have jumped up and into the picture? However, we can't account for the top part of the dark mass or the whitish part either.

Ghost or cat? You decide...