I doubt if its any sort of repeller, more likely to be something that has frightened her whilst alone at home, maybe someone trying to break in, or even a thunderstorm. What is she like when away from home, or do you ever take her out in the car to somewhere nice for a walk? Try encouraging her with a titbit and get her to sit or lay down for a while just a little way from the house, so she realises there is nothing going to harm her.
Do a bit of training with her and give her lots of praise for doing it, but try not to 'baby' her just be matter of fact when leaving the house.