I have tried many humidifiers. My son has had asthma & allergies since birth. The best one I've found is a Kaz, I put it right next to his bed on the floor. It's a cold mist, so no mold. It's very inexpensive at Target, about $20. The best thing about it is that it's dishwasher safe. There's no bleach or chemicals to clean it. I just stick it in the dishwasher. Other things that may help are the children's vicks on the chest, an open window in the winter & sleeping on an incline. I've had my son sleep in a recliner on really bad nights & when he was younger I would sleep on the recliner myself holding him upright. If she's still in a crib, they have the wedge that she can sleep on. Also steaming up the bathroom helps when it gets really bad. Good luck to you.