Why wouldn't she fight Cyborg at 145 to potentially be a two WC UFC champion. Yes, I think that Cyborg highly likely smashes her, but that does not lose her the 135 BW title belt.
IMO, she should do exactly what she HAS been doing, and follow Holly's lead (maintaining an active fight schedule). She has the belt and all of the leverage now. She can DEMAND that (as long as Ms. Movie Star) no longer is an active MMA fighter that she IS FUCKING defending her belt in (say August'ish) and that Dana needs to get his employees to get the fight signed. Ronda has NO CHOICE except to accept the fight ~ 6 months for now, or refuse it (in favor of D movie career) and vacate the August title fight to an active WMMA fighter willing to grace the Octagon with their presence.
I have never like Ronda, but give her massive props for being the most active champion in the UFC (PERIOD) and therefore the face of the company. That however is a double edged sword. She cannot in any sense of reality expect that the division could responsibly be put on hold waiting for her as a contender.