it means she has or has had MBD
This happens when she either can't get enough calcium or d3 or both.
The ribs weaken, break, and then heal again, but where they cracked you get the bumps.
This used to be kind of a common problem back in the 1990s when products other than rep-cal with d3 were used for veileds, is less so today with modern lighting and other good supplements.
The good news is with correct husbandry the calcium deficiency can be corrected. The bad news is the bumps will always be there.