She would still destroy everyone from 6 down (McMann, Zingano, etc) because they have zero standup game. In the top 5, she would beat Pennington and Pena pretty easily. Nunes and Holm are physically as big as/bigger than Ronda, have good to great footwork, and have enough punching power to stop her typical rush to the clinch.
Rousey was, and is, a one trick pony. Her trainer is widely regarded as the worst coach in MMA with standup being his weak spot.
Travis Browne, Ronda's current boyfriend, was 16-2-1 and a title contender when he moved to Ronda's coach. Since then he's 2-3 and the wins were against a guy who is now retired and a guy who is no longer in UFC.
If Rousey goes to a real camp, she's got a chance. If she sticks with the fraud coach, she needs to retire.