K.U.
There are many signs of them being ready to start trying potty training, and from what you have written, all that your daughter is doing is being aware after the fact that she has done #2. You can do on www.askdrsears.com and click on "potty training" and get more information and details from there. They need to show several signs of readiness before starting potty training - until then, it could just be an exercise in frustration. For some people, starting too soon just drags out the process and causes it to take longer (case in point - Sara B. It's taken almost 2 years from start to finish to potty train her daughter. Sorry Sara B.! Nothing against you at all!)
I've heard of some kids being ready at 18 months when they start showing interest in the potty - for most though it seems to be closer to 2.5 to 3.5 years old.