the warfarin should help and she does need to get off her bum and exercise regularly, even if she is in pain i'm afraid. this is what happened to my mum in august, so i do appreciate what a worrying time it is. basically, pulmonarry embolisms are blood clots in the blood vessel leading into the lungs and it is the prime site to develop such clots for a whole host of reasons (age, weight, cardiac health, level of exercise, diet - the list goes on). she should be ok when the warfarin levels settle, but she needs to be doing stuff - luckily my dad has dragged my mum everywhere he can think of to do this (as she also has osteo and chronic pain) and i'm glad i don't have to listen to the inevitable grumbling this will have caused. good luck, and if either of you have questions, write them down and ask the next dr you see to explain them - that is what they are there for.