Seamlessly Add Child to Photo

I need to add the girl circled in red to the picture of everyone holding up their rings. The girl can be in the back between two people, maybe there is a way to scoot over two of the girls in the back to make more room for her... (Budget: $10 - $30 USD, Jobs: Adobe Photoshop, Graphic Design, Illustrator, Image Consultation, Image Processing, Image Recognition, Photo Compositing, Photo Editing, Photoshop, Photoshop Design)