Oh dear. I think u need to really up up the water intake. I think u can wait a couple of days more and try some massage. Massage stomach in a circular motion (if baby is facing u, it's clockwise direction for ur hands) after baths and after eating (rest a while). Can also try to massage/stroke the tailbone in an top to tail end motion
Perhaps you may like to consider giving her a teaspoon of vco? Chilled solid vco doesn't have much taste, and it can help with popping. Definitely see a doctor if you are concerned. My child has gone a week without pooping around 4 months old but that was when she was exclusively breastfed.
I got them from NTUC finest. I've seen some kiddy palace, cold storage selling them too. Iherb has a wide range too.
Is your LO breastfed or formula fed?
Jinhui Fu Jacinthia