Yep, you're right, she's trans, but that's absolutely an extender, no doubt about it. I saw the video, she appears to take it off and sucks on the extender while covering herself completely with her leg. She must have a small penis and uses the extender as an illusion. It's obvious that's not her real penis.
I did some video CSI on a few camshow recordings and yeah, she's got a really tiny cock. epeHmm: The whole extender thing is ridiculous - I'm surprised it stays on when she's yanking it. It's a shame cuz she's cute and wish she'd just give it up and let it fly free. Some camshow recordings (the source of the pics & more) https://bunkr.cr/a/6dRwZOLF 'Almost' peeks and a couple of slomo's with better view