My guess would be malnourishment. It takes a lot from the fish's system to make those eggs. Some fish's spines will bend because of the extra weight coupled with a poor diet while carrying eggs. She could have also been predisposed genetically (had a defect) and is now showing the signs because she was carrying. What do you feed/were you feeding?
Has she been ill otherwise before? Something could have made her vulnerable to secondary infections...
Hopefully not, but it could be a bacterial infection. Piscine tuberculosis will cause a bent spine. This is generally brought on from poor water quality. So, have a look at your water parameters.
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