You should definitely remake the poll as soon as you find out more specifics. List the types of fights, stats, pictures, types of fights, ect. Just like last time.
Personally, I think this is gonna be a tough one for your girlfriend. Katelyn definitely has height, weight, and experience on her side.
Remember though, Meghan was heavier than her and your girlfriend was still able to defeat her. Your girlfriend has heart! Of course, Katelyn probably has some heart in her as well if she's a session wrestler.
I remember not thinking your girlfriend had a chance with Meghan in a catfight after Meghan had humiliated her in the wrestling match, but her heart shown through, and even though it was close, she managed to pull out a victory.
I think you should definitely see if Katelyn will be down with the "3 falls" thing that was suggested last time (Boxing / Wrestling / Catfighting). That way your girlfriend will only be at a disadvantage, experience wise, in wrestling. Make it a best 2/3.
I doubt Brittany will have much of a chance in wrestling due to the weight disparity, and considering she lost to the inexperienced Meghan, who is lighter than Katelyn. However, she just might have a shot in boxing / catfighting, although I'd still have to give the edge to Katelyn on paper. I'm not sure who will win entirely, but I bet the fights would be amazing/intense, probably definately ending in a knockout for boxing / catfighting. For the wrestling that might happen as well if you allow things like breasts / face sits.
Either way it sounds like she's really into this. It sounds like she wants to prove to herself and you that she can take a session fighter, which she see's as a step up from Meghan. For that reason she should definitely go for it in my opinion.
Also, just curious, is there a reason why she selected Katelyn for this fight? Other than that she is a session wrestler? I think you mention in the last fight there was a bit of bad blood between Brittany and Meghan right? Something about Brittany wanting to shut up Meghan or something like that. Is there any type of backstory or animosity between your girlfriend and Katelyn like there was with Meghan?
Actually, on the topic of Meghan, has anything more happened between her and Brittany? Have they spoken since the fight? I'd imagine Meghan must have been unhappy with the outcome of the last fight, right? Especially with the mutual knockout and it being so close and all? Has she talked to you or Brittany about a rematch at all? That seemed like it might have been a tough loss for her to swallow, you'd think she'd want to try and avenge it.