She definitely says and does two different things quite a bit. But to look into it a little bit...
She has six scenes with New Sensations that were all shot in 2019. Four have step bro in the title while another is actually called Gabbie Is Much Tighter Than Her Mom. That one may be about her mom's boyfriend but I can't remember lol. While they may not be specifically father-daughter scenes, all five are incest based.
During the early months of the pandemic (well, sometime in 2020 when she got a little thicc) she shot all those scenes with Michael Masters from Primal Fetish. Most of those are incest based. But, again, I don't think any actually refer to her male partner as being her dad. Side note, that man is a lucky bastard haha. I'd love to know if she just stayed at his house for a week to shoot all those scenes? There's not a ton but there's more than a handful and Gabbie looks the same in all of them. A dude can only stay hard for so long before medical help is required lol. But back to the main topic now.
There's that hour long scene where she gets the pair of Jordans and looks really messy. (Off topic again: What the fuck is was the deal with that scene? Did that guy just hire her for a "scene" to have sex with her? I've never seen another video that dude or his apartment was in (maybe it was rented for the occasion). He also had a small dick. I'd remember that dick if I saw it again lol. Until I see another actual released scene of the same dude fucking a different girl then I'm assuming Gabbie did borderline escorting.). Back to the discussion, two different angles where's he's just pumping away he refers to himself as daddy and she also calls him daddy.
I'm sure there's other examples but most are like generic incest vids (step bro actor and "daddy" used just as scene dialogue). I can't recall an actual stepfather/daughter scene. (EDIT: I found one. There's a scene on AmatuerBoxxx that's called I Fucked My Step Daughter After Bowling Night. That was filmed in October of 2020. There's probably others too ubt I won't keep digging lol.) I'm not into the incest scenes at all lol. I wish the trend would stop. It makes the scene start awkwardly and takes me out of the moment. Those are just my thoughts, to each their own. But I love hearing Gabbie moan and dirty talk when she fucks. She makes great noises. Her occasionally moaning out the word daddy is totally fine with me haha. I wish she dirty talked more. The ExCoGi scene (not the one with Nikki Venom) has some dirty talk but shes so into the scene that hardly speaks during it. At one point they tell her to call herself a whore and she can barely get it out because of the pleasure.
Lastly, I still 100% think the story of her having sex with her stepdad is true. The story came directly from her in the first AMA. She's never denied the story. Sometime just last Fall there was a post on the 4chan subreddit about it and she definitely didn't back down. At any point in her career she could've denied it. She could've said I was just starting out so I made up a story and went with it for industry clout or whatever. Any pushback from her would've given me some pause but she's never denied it. At some point you'd think a friend or whoever would tell her to stop saying it happened because it's such an awkward situation. Say what you want about her piece of shit stepfather but she not only fucked her mom's husband but she fucked the father of her stepsiblings. Their family must have the biggest fucking elephant in the room when they're having dinner. Like, holy shit.
These are just my personal thoughts. Everyone is entitled to their own opinion. I just want to see more of Gabbie no matter the plot of the scene nor what comes out of her mouth when she's fucking. And her actually being at AVN is a good sign we'll get to see more of her. At least I hope lol.