TSD incubation temperatures have been published and appears consistent, I believe it was @zovick that published on it, I do know I read two papers, one on it and one that touched on it.I don't know that 89 degrees produces females in platynota. No one seems to have the temps worked out yet. Mine were all temp sexed for female and they were 8.6. G-Stars got 15.0 that were all incubated for female at higher incubation temps. The split scutes are a good indicator though. At 7 or 8 inches, should should be able to tell the sex. I could tell at about 2 years old and half that size.
I have never seen or even heard of aggression like that in this species. Not with males or females, so it is certainly an unusual case. I had not heard of that with geckos either, so I learned something new today. Thank you for that.
However, I've done a lot of work on thermostats (mid process of designing/testing my own). I bought almost every thermostat on the market, for reptiles and for plants. NONE of them were consistent nor accurately calibrated. What is worse is almost none of them offer a way to calibrate. Some will swing 5 degrees consistently, most will display one temperature when the reading is actually way off. I'd be willing to bet money on the thermostats being the issue if incubation temperatures are not panning out.
She appears female for sure, I have no doubt on it. She is certainly aggressive to others, and is my only platynota that is so.