UPDATE!
I took Poppy to the vets this morning and the vet says her tail is deffo dislocated or fractured, but because its on the very end it should be okay.
She said when this happens they usually loose feeling in the bit after the fracture.
If it had of been closer to her butt it could be dangerous because she would loose feeling in most of her tail and then try and bite her tail off as she wouldnt recognise it as part of her body, but because its right at the very end she said that Poppy shouldnt even notice it.
She said it wasnt worth using a splint to straighten it because it would cause her more stress and it isnt causing her any discomfort at the moment so its best to just leave it to heal.
It will obviously heal with a slight bend in the end but I dont care aslong as she is okay and not in any pain
Would LOVE to know how she managed to do it though hmmm......
Thanks to everyone who replied Poppy feels much loved