Hi! I'm just starting out with all this sewing stuff

I'm trying to make a pattern from a shirt my daughter has. It seems like it would be very simple to make, front bodice just attached to a gathered section with a rufflle on the bottom and wide straps at the top, easy. So I took measurements and traced each piece, then added a seam allowance. Here's where I'm not sure what to do. on the back bodice there are two buttons, would I just make it longer to accomodate where the fabric needs to fold over for the button holes? Or would it be two separate pieces for the back bodice?