Michelle Waterson dominated her on the ground, again she tried to tough it out and ended up just going to sleep. Rose took 4 attempts (not 600), the first a RNC and 2 armbars where PVZ just toughed it out and the first one was very close to finishing the amount of blood from the axe wound on her face certainly helped her. It wasn't impressive defence at all and it's really not like Rose is that amazing on the ground less than a year prior Carla Esparza completely dominated her there.
In her last fight again she showed the same thing when she got caught in a triangle, she was tough as hell but it wasn't any decent defensive BJJ. She was stuck in the triangle JRC just didn't really commit well to finishing it and/or doesn't have great BJJ herself she just wanted to keep PVZ trapped and land elbows off her back after her initial mediocre choke attempt failed.
I'm not even going to go into how easy it is for people to pass PVZ's guard and take her back but it's not hard to see Ostovich as a far bigger grappler than Rose or Waterson being able to at some point take PVZ's back and sink in a choke she can't just tough it out of. If people want to just bet PVZ ITD or something good luck to them but given FDNGTD is available at decent plus odds I'll hedge my bets, being too specific with MMA betting never ends well long term as there's far too many variables and given PVZ is a fighter that has been finished by sub in 2 of her last 4 and caught in subs in all of her losses going up against a fighter who will spend 15 minutes going for subs I don't think see how it's a bad choice.
PVZ really isn't great defensively, great defence is not getting caught so deep in them in the first place, and Ostovich for all her weaknesses is more than capable of getting submissions.