My Warmblood licks what ever. After she eats a treat or eating her grain. Why does she do it?

My horse licks everything and I mean EVERYTHING. She could be bored. Try putting a salt lick in their stall or pasture and maybe even try toys like jolly balls.
There might be salt or the flavor left on 'whatever'.
My horse kind does something similar sometimes, she is looking to see if she dropped any because she wants more
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