It looks to me like that is a vintage quilt in a museum, so there probably is no pattern available. But as stated before, it would be a simple quilt to sketch out on graph paper and make your own pattern to follow. I believe that's what you're going to have to do. Use a pencil and ruler, follow the lines on the graph paper to keep yourself straight, and sketch what you see there, making any changes you want. (You may want the quilt longer and less square, to fit her bed better, for instance.) If you know roughly what size you need the finished quilt to be, based on that you can then assign a size to each square on the graph paper (one side of a square is an inch, or two inches, etc.). All you have to do then is add a half inch to the size of each square or rectangular piece (the quarter inch seam allowance) in both width and length, and you know how big to cut the pieces. Go for it!
By the way, welcome to the quilting board! I just noticed this is your first posting!
Last edited by JustAbitCrazy; 02-12-2013 at 01:05 PM.