Turning twenty; yellow brick road; rail fence; warm wishes; square in a square; are just a few of the hundreds ( thousands) of beginner quilt patterns. Have her visit quilterscache.com and browse beginner blocks ( I recommend fairly large blocks to start with) and see what appeals to her. Browse Craftsy and Pinterest, if she already knows how to sew it's not going to be too difficult for her to make her first quilt-- the hardest thing to learn is that 1/4" seam, since in apparel and home dec, crafty sewing we always use a 5/8" seam ... which is more than twice as wide as a quilt pattern seam. So, first things first she needs to practice some blocks to learn that straight 1/4" seam ( rail fence) is great for that. Once she has that 1/4" seam down the skies the limit for what she can make.