Sorry, new here. It looks like in training mode, after being on top of the staff once, you can use the astral heat off of the staff by running towards the enemy and using the easy mode command, it will have Litchi pass through the enemy and perform the astral heat. I found this on gamefaqs thread 'Litchi Astral Heat glitch'
That only works with the easy mode command, but messing around with it, it looks like you can cancel out of her back dash and cancel into astral heat (447 to 4~6D) by just regular command motion. Its pretty neat, don't know if that's combo-able, I'm quite a beginner with Litchi and still trying to learn her combos.