You have the start of a very nice quilt there. I would not worry about making it too matchy, what she has started looks really nice. I would make them 3 rows (13 pieces per block.)- 3 logs per side.
There is no standard, just do what looks good to you. I would do a simple Barn Raising with those blocks but there are plenty of other ways to set them together.
Check out this link for pattern ideas.
http://www.quiltingboard.com/blogs/q...ery-b2181.html