This is a lighter photo of her molt compared to my first picture a few days ago. I apologize, I know it's a bit blurry. However, I am confident that is a clear spermathecae. She is currently a 3.5" juvenile.
I'm struggling as well. At 3.5", the spermathecae should have a lot more colour to them. They wouldn't be so transparent that you wouldn't see them at all, even when the exuvia is wet. This species only get to 4.5-5" as an adult - at 3.5" they are a sub-adult and their spermathecae would be darker.
This is my female at a full inch smaller and you can see how much colour the spermathecae has. At 3.5", I would expect it to be far darker.