Top women's bantamweight contender Julianna Peña calls Ronda Rousey's immediate title shot 'bullsh*t' and is considering leaving the UFC.

On Wednesday, it was announced that former UFC women's bantamweight champ Rousey was going to resume her MMA career after about year away from competition. And for her return fight, Rousey will be getting a title shot against now champion Amanda Nunes at UFC 207 on Dec. 30 in Las Vegas, Nev.

Peña, who's currently ranked fifth in the division and riding a four-fight wining streak, has been campaigning for a title shot for some time, and she's not happy Rousey is getting the shot over her.

"It's bullshit," Peña told MMA Fighting. "That spoiled brat has gotten everything handed to her, and she's getting everything handed to her again. It's bullshit."

Peña doesn't understand how Rousey, who hasn't fought in almost a year and is coming off a devastating knockout loss to Holly Holm at UFC 193, was able to get an immediate title shot.

"I have no idea," Peña said. "Never in the history have I ever heard of somebody have a no-controversy brutal knockout, then quit the sport, and then comeback and get a title shot right away. The girl is mentally weak and Amanda Nunes is going to f**king knock her out and expose her ass. She's literally the worst fighter on the roster, and I can't stomach the fact that I'm not getting the title shot. I don't know how they conduct business over there, but they're going to do what they want no matter what, so there is not really much I could do. Back to the drawing board I guess.

"I don't understand. I think Alexis [Davis] went and got two split decisions, and she got a title shot. Bethe Correia took out Ronda Rousey's camp – Shayna Baszler, Jessamyn Duke – and Ronda was all up in arms about it and wanted to get revenge for them. But I beat her whole entire team. I took out her whole entire team on The Ultimate Fighter, and I didn't get a title shot then. You know, these other girls are getting these title shots coming off of losses. There are girls that just say her name and she calls them out and then they get title shots. I'm honestly so confused and all I can say is that it's bullshit."

The 27-year-old Peña believes the reason why she hasn't been able to get a fight with Rousey it's because Rousey is trying to avoid a beating.

"I definitely think she's trying to avoid a fight with me, 110 percent," Peña said. "That girl is running from me. I won her whole show and she sees me to continue win, and she's yet to say my name ever. She's definitely avoiding me and if she comes back and wins this one, she'll probably retire and never fight again. She's going to do everything possible to avoid me for the rest of her career. She doesn't want anything to do with me and I don't blame her. She knows I would whoop her 'f**king ass."

Peña says the UFC has not contacted her to see what they have planned for her. She says she's now considering leaving the promotion after learning that Rousey was getting the title shot.

"Maybe I'll go fight for Combate [Americas] or something because it sounds like they want to pay me serious money and actually give me a belt right off the bat just like they did with Ronda in the UFC," Peña said. "They just handed Ronda a belt and Combate will hand me a belt, so I don't know, we'll see how that goes.

"It's definitely something that I would consider, you know. It's starting to become a fake toy belt [the UFC belt]. I fight for money, I'm a prize fighter. So if somebody else wants to give me more money, I'll gladly sit down at the negotiating table and see what's going on and what's being offered."