Well first off, you need to figure out what caused the RI because unless you do, treating it wont help. And not to sound like a jerk but if she has had RI for a year or two, then that is really bad on your part. For something slight, you can raise the temps but in all honesty, you should take the snake to a herp vet. It is your responsibility to keep any animal you take under your care healthy. If you can provide that, then might be a good idea to rehome them. Again, not to try and sound like a jerk or be harsh but it is the truth. I don't know about stuff like vicks vapor rub or eucalyptus oil, not sure I would want to try that stuff. I have heard F10SC work but you need to nebulize it with a nebulizer. And again, unless you find the cause, your snake will just get the RI back again. Snakes in good health and good husbandry can generally fight off mild RI on their own. My advice is find a good herp vet, make an appointment and get a general check up done as well as a culture to find out what is causing the RI, be it bacterial, viral or fungal. Then you can work on fixing the husbandry.