tongue flicking

I got my first leo today, YAY! well i haven't been bothering her because she's pretty scared bing in a new home and all, but when she was exploring and i got close to the cage i noticed she would flick her tongue out and ocasionally lick the glass. does anyone know why she might be doing this? she has water,(she ran throught it a few times), and mealies which i put one in front of her and she didnt seem interested, so i was just curious as to what she might be doing. oh, i'm not sure of the sex yet because most petstores dont bother to check or find out from the breeder but i'm refering to it as isis until further notice

mine does this when i pick her up out of the tank...i think it is a way of smelling, like snakes.