I've never kept the species in question, but have seen similar reactions with a couple of others.

I had a particular female leo who would tolerate males and did lay eggs for me (though none ever hatched) but would not tolerate other females in the same enclosure and would eagerly attack them.

Also a friend of mine had 1.2 S. sthenodactylus, but lost one female unexpectedly and gruesomely (limbs & tail missing when he found the body), and noticed the other female getting very aggressive, displaying behaviour like you described. Then the male died (also gruesomely) and he rehomed the aggresive female to someone else with this species. The new owner later stated this female had become very aggressive with his breeding group as well and had to be kept seperate.

In the case of leopard geckos, I am aware of "hot" females, which hatch out at "male" incubation temperatures and display a lot of male characteristics such as territorial issues, aggression towards other males and difficulty breeding. I'm not sure if it's been proven with your species or the S. sthenodactylus, but if their sexes are temperature-dependent at incubation, it's possible these are examples of "hot" females?

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