In the years since her landmark 1993 album Exile in Guyville launched her into indie-rock stardom, few artists have watched their critical reputations plummet quite as precipitously as Liz Phair. The 90s saw the release of two tepidly-received sequels on Matador Records, and she was widely excoriated for “selling out” on her ultra-commercialized 2003 major-label debut, only to be dumped by her label and management on account of her “batshit weird” new album, Funstyle. Phair has remained largely (and laudably) unapologetic about her career choices and aesthetic shifts, and if last Friday’s concert at the 9:30 Club is any indication, navigating through such crests and troughs has relieved her of some of the pressures of her iconic status — leaving Phair a refreshed, reinvigorated, and more self-assured performer.