Friidu hasn't been moving as well as usual for already some time, now the thing became acute as she started screaming outside and has had it hard to stand up and lie down. The diagnosis is now herniation (the discs in vertebrae push the nerves), but to be sure (if she doesn't get better on two weeks) we would need to do some MRI for her and maybe surgery.
Next two weeks will show how it goes. Keep your fingers crossed for her!