Hi lingz, your baby is exclusively breastfed? My baby was on total breastfeed, and there were some period of time he would poop several times but there are times he would go almost two weeks without poop. Breastmilk is the prefectly designed for baby and it is digested completely according to babies need, that is why sometimes there is no waste. And breastfed baby normally doesnt get constipation. If your baby is not fussy or in pain or struggling to poop and look normal and happy, i think there is no problem. But continue to monitor her, if there is no poop after 2 weeks can try to see the ped.
Hope it helps