Only quote I can find for Chin is
AAC, Ch 67 wrote:Chin nodded back. Sabourin was probably the only member of her staff who could fully savor her own sense of . . . completion. She'd come a long way to reach this point. She'd survived being scapegoated by the Legislaturalists for the disaster of Hancock Station at the very start of the last war. She'd survived long, dreary years in the service of the Committee of Public Safety—never quite trusted, too valuable to simply discard, always watched by her people's commissioner. She'd even survived Saint-Just's ascension to complete power . . . and the chaos following his overthrow.
She'd been "rehabilitated" twice now. Once by Rob Pierre's lunatics, solely because she'd been scapegoated by the previous régime. And once by the new Republic, because she'd damned well done a good job protecting her assigned sector despite the psychotic sadist they'd assigned as her people's commissioner.
This time, she actually believed it was going to stick. She'd still lost a lot of ground in the seniority game. Men and women who'd been junior officers, or even enlisted personnel, when she'd already been a flag officer, were senior to her now. Thomas Theisman, for one, who'd been a commander when she'd been a rear admiral. But she was one of only a handful of people who'd made admiral under the Legislaturalists who were still alive at all, so she supposed that was something of a wash.
Bolding is my emphassis, so Genevieve Chin DEFINITELY got handed back to Haven after her surrender in Hancock, but before the war lasted too long and Pierre/Saint-Just stopped going for any prisoner transfers. That she was scapegoated by the Legislaturalist's
first heavily implies she was handed back in the weeks between Hancock and Manticore officially declaring war.
It takes approximately 2 weeks to travel from Hancock to Manticore (even when Nike wasn't shot up, as per the conversation when she arrived in Hancock short 1 fusion generator), the trial itself stretched at least a few weeks (Honor had enough time to take vacations on Sphinx and see her parents before appearing in court) but let's call that a full T-month. Guilty verdict and instantly inheriting due to his father's heart attack and passing, then at least another 2-3 months for Pavel Young to be seated and then speak in favour of the war declaration, debated and put up for actual voting.
All totalled up, that puts Chin at being traded within 4-6 months of her surrender at the longest, and more likely only days/weeks after surrendering. Pierre pulled his coup over the Legislaturalists within 3 months of Hancock, and they had to have Chin back to be scapegoated before OSJ could start executing the Legislaturalists.