As the others have said, pedal forwards. As long as there is no problem when riding normally I wouldn't worry about it.

I suspect that the Low adjust may be a bit off a slight bit causing the chain to ride just to the outside of the large cog instead of being centered on the cog. It may not be off enough to cause trouble but if your daughter notices her chain jumping off the large cog to the second cog you may need to adjust it or if the bike is new take it back to the shop and have them do it.

Mike