In Nightfall (book 5) it's revealed that she's pregnant with Tyler Smallwood's unborn twins so I guess it was between book 4 "Dark Reunion" and livres 5 "Nightfall"....
in the end of the 5th book, she was whining that she needed a husband ou a fiancee. cause tyler skipped out on her. then she a dit that matt raped her in the 7th. she wasnt mentioned in the 8th and 9th, so we don't know if she's had her "puppies" yet