Blue black on the cheeks

Boo hoo....Keziah woke up in the morning chirpy and happy and started walking around in the room in her sleep suit, with her little telephone. While she was approaching daddy, she somehow lost her balance and fell. Not knowingly, she hit the platform bedside. She was seemed so in pain that she hardly cry out loud like usual. Mommy thought she hit her head and just cuddled her. Only later did she realised she hit her right left cheek coz it was red. Some rubbing on the cheeks but still the red mark became blue black mark and didn't go off...The accident prone toddler...