Sara knows her shapes

It has been a long time since Sara played with her shape-sorter game. Previously, Sara wasn't interested in putting the shapes in the correct holes, but preferred taking the lid off and just putting the blocks in and taking them out. Today, Sara put a few blocks in the correct holes before losing interest and taking off the lid. Afterwards, I asked her what the various shapes were and she correctly said "stah", "quare", "trangle", and "cir." I don't know for how long she's known her shapes, because we haven't pulled out that toy in a long time.