Sandy doesn't understand me very well anymore (via Twitter)

Until yesterday (5/7/08), Sandy understood pretty much everything I sent her using Twitter. Now, she seems extra picky and I can't get her to understand some of my requests. Here are a couple examples (I put curly braces around my messages to set them apart - they weren't used at the time):

1. I sent {d s r help Dad L with his brochure @todo @all} and Sandy replied with her standard "don't understand" response (Hi! To remember/remind: "d s r take a break in 15 min"; To update: "d s u 1 @done"; For more: iwantsandy.com/examples). I tried {d s r "help Dad L with his brochure" @todo @all} and she responded the same.

2. I sent {d s r write letter to ruby about her sunshine and exuberance @todo @all @computer} and Sandy would simply NOT GET IT, even if I surrounded the main part in quotes like I did above. I played around with this for several tries, and oddly Sandy would understand {d s r write letter to ruby about her pens and pencils @todo @all @computer}! That is exactly the same except for the two content words. It makes no sense.

In both cases, I had no idea what the problem was and gave up trying to ask Sandy to remind me about it. It's very frustrating.