Why now? Saudi Arabia releases prominent women's rights activist

She's out of jail after 1001 days. Up to now, Saudi authorities had shrugged off international condemnation over the imprisonment of Loujain al-Hathloul and other leading women's "right to drive" campaigners. All the while she was behind bars, Crown Prince Mohammed bin Salman agreed to let women drive and scrapped male guardianship rules for women over 21. So what threat exactly did she pose? Why the conditional release when just six weeks ago, she was sentenced for undermining state security?