This little slit was on the right side of her knee where the leg was too narrow to rotate on my machine. I pinned the flannel, then stitch forward and back at a slight angle which left a wide zig zag appearance to the mend. It wasn't my first choice of how to mend but it worked.
For the big hole on the thigh, I stitched around the hole twice. Once to attach the flannel to the jeans, then again to secure it all together. I try to leave the frayed edges fluffy as it adds to the country girl appearance. I will trim it shorter if necessary but we really think it looks cutest frayed and with the flowers peeking out. You can use clear tape to make it lay flat out of the way if it bothers you while sewing.
The big T shaped hole I mended in stages. It started on the thigh and ripped down to the narrow knee. The kid has a gift for destruction.
I call this mending 'Frankensteining' because it tends to look ugly and patched together any old way. I take bits and pieces, remix them to make something better. Regardless of appearance, it works. It's imperfect but sturdy. These jeans have already been worn, washed and worn again. My daughter loves her mended jeans because it flaunts her girly side to have flowers peeping out. No matter how much mud and muck covers the rest of her :)