I understand that you are frustrated, but let me show you the flip side. Today, I was at Office Max with my 3 boys. They were ok, not perfectly behaved, but not monsters. The cashier told me a minimum of FIVE times, that I must be a very patient person, b/c she doesn't know how I do it, blah, blah, blah. I just didn't respond to her weird comments.
Also, your dd is only a little over a yr old. At that age, they are usually pretty manageable. Wait until they are 2-4 and ALLLL over the place and you may have another child or two by then to add to the chaos, it can snowball very quickly.
Plus, one child could be perfectly behaved, while the other ones is a daredevil. Then you may think back to these days and realize why ppl seem incredulous that she is well behaved.
Or, she may continue to be perfectly behaved, but even my friends with perfectly behave dd's, they all went through a phase around 4-6 that was rough and it shocked many of us that some of these girls who were normally so, "good" went though a phase too.