"Usually" chips like that seem to be ok. I have a tank with one very similar running right now for over a year. It's only a 40 gallon. If none of the silicone looks damaged, or miscolored, etc. I would run with it. Any tank can fail, but I wouldn't lose any sleep over it if it were mine.
There's some videos out there on how to put on corner guards. They make the tank look better if the edges and/or silicone is messed up. I'm not sure if they actually provide any more strength when done the way I'm talking about on an existing tank, on the outside. May help if your daughter, dog, and macbook pro happen to find eachother just right again.
Good luck with it! Let us know how it goes!