how long has her neck and back hurt? how old is she? if she has constant back pain then maybe she is addicted to pain relievers and when you are adicted you need more and more. my suggestion is to have blood tests done, make her go to a doctor or tell her she will have to find another job. she might truly have back pain, i have an arthritic back and i am always in pain but you learn to deal with it. if this is something that just started happening maybe she hurt her back but she should have it checked out first by a credited doctor and then a orthapedic doctor. she better have something checked out soon because it can lead to nerve damage and she can't work with the pain.