She may be a shitty coder [1]. But her code worked at the time she wrote it, right? And it only broke after you went in and fiddled with the database without first checking to see what systems and programs were using that database and how your changes would affect those systems and programs, right?
[1]Or she may not be. Often times when you develop a system or even write a piece of code, you operate under certain constraints that might make it impossible to make it fool-proof. You may also not have the opportunity to come back and refactor it later. Maybe that was the case when she wrote her code. You may have had the time to debug what she wrote and even re-write it from scratch. She may not have had that luxury.
Heck, maybe she wasn't even a professional programmer. Maybe she had just taught herself some basic programming and wanted to apply it to the job to add value to the company and succeeded in doing so, and she had no idea that some douchebag would come in at a later date, break her program and then blame her for being a shitty programmer. The point is: her code worked at the time she wrote it. It was you who broke it. End of story.
