Hmm.. I haven't had much experience, but I've had a few constipated froglets... they didn't poop for ages. What I did to loosen them up was give them a 1/2 hour honey bath; honey acts as a natural emollient and stool softener. Add 1 tablespoon honey to 2 cups warm (but not hot) dechlorinated water), and stir in the honey until it's dissolved. The water should be sweet but not syrupy.

Give Lola one of those soaks a day until she passes a bowel movement; that's if you're sure she hasn't passed one lately