Your Sister needs to be congratulated, I know people who have been watching the skies for longer than many on here have been alive, and they still
struggle to get a decent image.
I am intrigued as to what it may be, I would think if someone was going to alter the EXIF data, then they would have gone a lot further to fake a
picture than what we see in the image.
The problem with digital images is the pixel disturbance like what you see around the object, that's a great reason to use older equipment with film,
its a lot easier to pull out a digital camera in the moment, which itself can be an achievement if your not ready or watching the skies waiting in
case you see something.
Which is why she should be proud of herself, no matter what it turns out to be.
I have seen images of similar objects many times, its hard to determine altitude, I think it was maybe maybe not who said, it could be really close or
miles high in the sky.
It would be great if your Sister or other witnesses had an idea of the height, and if anyone saw it leave, my impression is it is out of place in the
sky, so needs to be looked into more.
I think people would have been aware if it was a balloon or a Frisbee, the Frisbee can be ruled out if it was seen to leave, they have a habit of
falling back to earth, a balloon would have been visible for several minutes and have been a little obvious to be honest.
Thank you for sharing, hopefully your Sister may be able to shed a little more light with a little more information, the problem is that the picture
was taken quite some time ago, she might have a problem remembering all the details, and yet she may remember the event as clearly as if it was taken
Would it be possible to ask any of the other witnesses what they remember? the more information the better obviously.