Any ideas why Aura is putting head down?

[Celtic Hill Farm]

when i ground drive Aura, she puts her head down. I can't figure out why. Mabey is it the bit?

 

[markadoodle]

Well it is hard telling maybe it was that she just wanted to test you.like when horses test u when u ride them they strech there necks and pull u... then agian it may not like the bit ether. hope somthin' helped.