C.J.
We had a strange crack like that in our dining room. We painted over at first and looked good, but about three months later it started to bubble and detatched a very large portion of the texture/paint on the ceiling. Ended up having to scrape and retexture the entire ceiling - ARGH.
So - my suggestion to you is find a fun, drop-in play place on a Saturday morning for your toddler and do a little scrape and touch up;)
Good luck!