it may be dule to dry hot climate but other causes like allergies, irritated mucous membranes in her nose, frequent nose picking, upper respiratory trct infections and bleeding disorders. so better to clear all your doubts by consulting ent specialist
.just follw some simple tricks to control bleeding-
1-have your child lean forward (if she leans back she may swallow the blood and cough
2-squeeze the tip or soft part of your child's nose, just below the bony part, so that her nostrils are closed. You can do this with your fingers, tissue, or a washcloth, and this will allow the blood to pool in her nose and help it clot quicker
3-continue to squeeze her nose for 2 to 3 minutes and try to avoid frequently checking to see if it is still bleeding. After five or ten minutes, when you finally do release the pressure on her nose, if it is still bleeding, then hold it for another 2 to 3 minutes.
but you should consult the dr. first if its repeated and severe. take care.