tjradj,
That was it. That was the problem.
With a fiddle of the upper tension, she was away.
She sews a beautiful stitch. I filled up a whole 8x8 piece of double fabric with thread just waiting for the problem to happen again, but it didn't.
That little burr was enough to stop that machine from sewing.
So I called her mama, and she'll be going home soon as we can get together.
But not before I play with it just a little bit more......
Congratulations, I'm sure you will be asked by others for help on their little machines. Good job!