i think she's actually doing a heel-toe step. ya know, the one where you're flat footed & propel yourself by switching between moving the balls of your feet & then your heels. i say this because when she does the move there is no level change. if she was doing it on the balls of her feet she would go a bit higher but there's no difference between moves. when she turns backwards with it at 3:28 you can see her heels on the ground.

as far as my two lil' cents goes about the terminology i was taught the ball of your foot thing as different forms of arabic. it's been a while since i've studied cab. so bear with me... arabic one is the one you were originally explaining about being on the balls of your feet, arabic two is the same but on the first count you step flat on your foot & then you're up on the balls for the other 3 counts (flat ball ball ball flat ball ball ball etc.), aaaand i think arabic three is ball flat ball flat ball etc. i could have the names on these all switched around but you get the idears =D and of course when doing these foot patterns you have your right foot slightly ahead of your left.

i have heard the heel-toe step that i was talking about often referred to as the glide so that's what i think of when i hear that particular term. it definitely seems more "glidey" than the arabics (ball steps =) to me. kinda like a sideways moonwalk....