The dry, moisture deprived air created by indoor heating systems causes the mucous membranes lining the nasal passages to become dry and flaky, increasing the risk of a nose bleed due to the lack of humidity. It is NORMAL to have a nose bleed during winters.
Preventive measures: To cure nose bleeds, drink lots of water and keep well hydrated. Get a humidifier for her room if possible.
How do you stop a nosebleed once it starts? The quickest way to stop a nosebleed is to pinch your nostrils together for ten seconds while looking up at the ceiling. This should allow the nosebleed to resolve fairly quickly if you aren't on aspirin, anti-inflammatory medications, or fish oils which can keep the blood from clotting in a timely manner.