I'd say this is impossible, and that's something I don't say for many situations.
Wu Zetian became a ruling Empress because of extraordinary personality and extraordinary circumstances. She was the exception, not the rule, and her accession was considered illegitimate by many because it went against several thousand years of Chinese culture. Before this, men had always occupied the Chinese throne. She barely became Empress, and there's no way she's getting her daughter to succeed her. One of the reasons she wasn't quickly and violently deposed was because she already reached a tacit agreement with the bureaucracy that the Tang imperial family would return to the throne after her reign. In fact, one of her sons, one of the former Emperors, was already Crown Prince after 698. And even if none of her sons were still around, there are a dozen of her husband's grandsons around, and probably hundreds of more distant members of the imperial family, all with a better claim to the throne under patrilineal succession than a princess.
Additionally, China didn't have a long-running tradition of monarchs who reigned rather than ruled because by the Tang, it was a well-established principle that any person with enough support (in times of peace this meant practically nobody but in times of war it meant any warlord with enough men and success) could become Emperor and establish a legitimate dynasty. No figureheads were needed.
In short, it's impossible for Wu Zetian to create a line of female empresses, which continues for any length of time.