I don't think Judith is dead. Screencaps show her buckled into her carseat, and the bloody seat has the belt unbuckled.
https://25.media.tumblr.com/4d97edce229a5bcf04ef6adb2173e769/tumblr_mx5tx1CADw1qi3qtno1_1280.png
https://25.media.tumblr.com/3ed8e743bab87559d11998f9b8f1a6b8/tumblr_mx5tx1CADw1qi3qtno2_1280.png
Somebody took her. Probably somebody that was bleeding heavily. Maybe the drunk black medic guy that got a through-and-through wound.
Also, it'd be really sloppy writing to have those kids leave an unattended baby strapped in a carseat during an attack. Those kids are brighter than that.