Sounds like you need to go right back to basics...
* The Olive should not be in an enclosure, it should be in a click clack (no bigger than a 45L).
* A small black hide that the snake can just fit in to. Do not have a gaping hold at one end, the snake needs to be kept very secure and kept dark.
* Paper towels and spray the inside of the click clack with water twice a day, this will keep the humidity up, keep the snake hydrated and will help with shedding.
* keep the click clack hidden from traffic in your house.
* I know it's hard with all the meds at the moment, but the longer you can keep away from the Olive, the more likely your going to get a feeding response.
* Do not use rats/mice anymore. An Olives natural food in the wild are small birds such as quail. Buy some day old quails, warm them up under hot water, towel them off (not too dry, keep them slightly moist). If your Olive doesn't show any interest, pull the quail away from her so as not to let her crawl up the tongs and on to you. Than offer the quail to her again. If she still does not strike, try tapping her on the side of her neck, or even on her tail, this gets them fired up causing them to strike. It may take a couple of strikes, but once she gets the taste, she should strike and coil. Also try and offer the head end to her, so that when she does strike, she will not have to release to find the head, she should start swallowing straight away. Once she has coiled Sarah...DO NOT MOVE. Any movement what so ever and she will release. If you have to stand there like a stuffed mullett for the next half hour until she has devoured the bird, than it will be well worth the frozen moment
If you need any photos of my setup or further advice, pls pm me and I'll be glad to assist. I have 11 Olives at the moment and are all going onto their 3rd feed.
Hope this helps Sarah and keep us posted.