Yeah, that's exactly what happened. I often try out a lot of different dialogue, and most of my scripts go through several stages, but the crucial one is the one right after the art comes back with tentative lettering, because that's the final stage.
I am not sure where the 'hetero to the bone,' thing actually was coming from, as it's not how I think of Diana. I needed the line to be fierce, and while I thought her saying "and at least 70% hetero" was a much better line, it didn't have the appropriate dramatic punch I needed for that moment. In the end, I switched it to that anyway as I felt it made the point.
I still have the corrected script. When the actual issue came out and none of the fixes had been made, I was heartbroken. It not only didn't say what I wanted to say about Dinah, it sort of flew in the face of the interactive flexibility that I had wanted to build with the character. It should have been an important moment, because it states, for canon, a bisexual curiosity, at least.
But a couple important things...the editor of the book at that time was an openly lesbian woman and activist. She didn't take the comment out on purpose, it was simply a matter of the book running very late. A similar thing happened on my first Teen Titans issue, to much more devastatingly terrible effect, unfortunately.
And yeah, I'm still bummed about it. Even more irritating is that I had a chance to fix it in the TPBs and wasn't told about it in time.
Bleah.
Dinah's love for Babs is pretty obvious anyway, I think.