Lacy Poncho for Little Girl

My first hand made Christmas gift is completed!  This is a lacy poncho made for a 3 year old little girl.  I'm a little concerned that it will be too big and fall off her shoulders.  I am planning on having my 4 year old son try it on, but I keep forgetting, plus the fact that it's pink makes me want to do that when my husband isn't around!  The poncho knitted up very quickly because I was using size 15 needles and a bulky yarn (just yarn found at Walmart).  This is two knitted rectangles that are sewed together.  My rectangles ended up more like parallelograms, even after blocking them.  This was my first attempt at blocking, so maybe I didn't do it correctly.  The pattern is from the book Speed Knitting by Kris Percival.  This is what the picture in the book looked like:

 

I think I also need to work on my seaming, the picture in the book looks better than mine.  Fortunately, I also bought purple yarn to make another one for my other niece!