Ah congrats sa milestone, mama! At 3 months, formula-fed babies can usually handle longer stretches at night, so 6-8 hours straight is generally okay, a lot of us have LOs na ganyan na at nag-thrive pa rin. Since she's feeding well during the day (3-hour intervals), I'd say let her sleep, pero I'd suggest checking in with your pedia just to be sure she's gaining weight properly and to get their go-ahead, kasi every baby is different pa rin. Honestly, marami sa amin swear by night weaning once baby reaches that 3-month mark at healthy weight na, so hindi ka nag-aalala lang, you're probably doing great!