Spaying your little girl will in the long run be a very wise choice for her overall health and well being. There are way too many stories about accident that happen and litters of puppies. Little ones that are lost or stolen~which is the most frightening for me. It is always the first thing that runs through my mind when I hear about a little one that is missing. Is she spayed?
I think that you received great advice already. The procedure is very quick and done millions of time safely. It's one of those hard choices that we make to ensure a safe and loving home for out babies.