Question Author
Thankyou for your replies. She seemed absolutely fine in herself so I fed her bland food (although she loves rice) and wormed her immediately after her bum shuffle. No problem since, it must have been something she ate. I give her bones, but only ones from the pet shops or supermarket. There seemed to be a jagged edge on one of them so they have all been taken up and substituted for a new toy.
We've still been checking her often incase of any underlying causes. I've panicked in the past with pets only to find no problems, so I didn't want to jump the gun.