Thanks for the extra information.
Usually, when this happens in older dogs, it is due to a loss of function in the nerves that supply the back legs, often due to age-related degeneration, or even a problem with one of the discs in the spine that sit between the vertebrae.
The fact that the condition in your dog does not appear to be paiful again suggests that the problem lies with the nerves, as dogs need intact nerves in order to move their legs, but also to feel pain. This may also explain the lack of tone of the vulva. Although it is not possible to say exactly what has happened without being able to examine your dog or perform any tests, at the age of 11 I would imagine that if there has been deterioration to the point of complete paralysis of the back end, the chance of resolution back to a normal dog is unfortunately unlikely. This may or may not progress to incontinence too, but it's again difficult to say.
I would say though, that the most likely way to get any improvement here would be to seek conventional veterinary treatments rather than home remedies - this is a severe and debilitating problem and it would be better to go straight for treatments that have scientific backup, as you might end up spending more on home remedies that don't work. In situations like this, if you want to go ahead and treat her, your vet may well consider corticosteroids as the best option - if so these are not expensive to supply once the dog has been examined and the vet has determined if this is suitable. It's also important to take care when giving medicines at home without the supervision of a vet as the drugs designed for humans are often not suitable for pets and can cause nasty reactions, toxicity and side effects.
If you are looking down the route of alternative rather than drug therapy, then you may find that your dog might benefit from some acupuncture - this can help to relieve muscle tension, increase blood supply and nerve regeneration in some cases.
At home i think the best thing that you can do would be to try to protect the areas of her legs that are in contact with the floor form getting sore, rubbed or ulcerated due to the extra pressure put on them. Padding the floor with mats and blankets can help, as can putting socks etc over the feet if the top side of the foot os getting dragged and damaged. You can also try to provide soe physiotherapy t try to keep the muscles supple and the blood supply up and running - this involves gentle massage of the legs from foot up towards the body to help the venous circulation and stop fluid building up in the legs. Moving the legs gently through their range of movement in terms of gently flexing the legs comfortably and extending them can help to keep the muscles going too.
In the long term, the way you feel about having a paralysed dog, and the dog's quality of life are very important things to consider. Lots of people feel that they are able to allow an good quality of life to dog that is permanently disabled but it is a really important thing to think about - the dog may appear happy at the front end but the loss of the function of the hindlimbs is very difficult for them to deal with. You may want to take advice from your vet here, even if it is by phone, to discuss your options.
I hope this helps,