I don't know what would cause this, but if it becomes necessary to take Malia to the vet, is there any way you could get a vidoe of her doing this? you can't guarantee she will do it on demand and it might be eaasier to show than explain.
On a happier note, welcome to the board, and since the other members seem to be neglecting their duties: Pleeease post pictures of your animals so we can admire them for you?