Reese has recently become horrified of going out in the grass when it is dark, I have to pick her up and set her out in it and then she just pulls her ears back and sits there and will not move. I have tried walking a distance from her and calling her to me, tugging at her leash, walking around slowly hoping that she will follow, bribing her with treats...nothing works, she just sits there with a scared look on her face shaking

Tonight when I took her out I tugged very gently at her leash and she started to cry. She isn't going potty inside and she isn't going at night or in the morning because she is scared to go out in the dark, and she is staying with a friend during the day who informed me that she is only going maybe once or twice when she is with her...what should I do???