I don't think you have to worry about her not eating- I mean, I think she is refusing for a good reason, such as being about to enter a shedding period. Just observe her now and see if she has gone into hiding. In five days, try again. We'll know more about her shed status then. A previously reliable feeder, skipping one meal, isn't a cause for concern, (aside from you being worried about her weight since she is on reduced meals) and not soon enough to start messing around with any "tricks" to get her to eat. If a snake refuses because it is blue (or direly ill) then scenting, etc. aren't going to help.