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I am sorry to hear about your dog. My name is Rebecca. I am a veterinarian and will do my best to help.
It does sound like she is in pain, and good pain medication might improve her mobility and comfort. Oral narcotics like morphine are not well absorbed in dogs and would not normally be used to treat pain in dogs. If she is still eating so well, then I would not think it was quite time for her to go. However, I would start her on a nonsteroid anti inflammatory drug such as meloxicam or carprofen, combined with a pain drug like tramadol or gabapentin. Supplements like Doggone Pain, fish oil, and glucosamine may also be helpful.
I sure would try to get her comfortable with medication, and then evaluate her quality of life, if she were my own dog.
You will probably not be able to have her pass away at home with oral morphine. It is nearly impossible to have a dog pass away with just oral medication. You will need a veterinarian that will come to your house, and administer IV injections for that.
Let me know what other questions I can answer.
I hope you were able to see my response! Please let me know if this was helpful, how she is doing, and if I can answer any more of your questions.