“How can I help my child sleep with a stuffy nose?”

It's so hard having a sick kiddo.  Using a cool mist humidifier can help quite a bit.  If shell let you, you can use a nose Frida or bulb suction to get some of the guck out (possibly with some saline drops to start), but shes is at the age where that's tough to do without buy-in from her.  If she doesn't move around too much, putting an extra pillow or two under her head so that she is more upright can also help.  Unfortunately, there aren't any medications that are safe or effective.  Hope she feels better soon!