From February 5th's confusion:
Rei has also begun speaking in Spanish. We can tell when she's counting (uno, dos, tres ...) but a pair of related words that sound like "sudza" and "sadza" has us baffled.
I now know what she was talking about. As Dora and Boots travelled to the Big Piñata at the Carnival, they had to fix the Ferris Wheel by replacing missing struts. They varied in size from long to short, "larga" and "corta". The accompanying hand gestures now make sense.