Sometimes puppies go through a "fear period" where something that they're usually fine with suddenly becomes scary. It could be the sound of the garage door, the door opening, or anything, really. It's usually something stupid. It's possible she has hit one. In that case it's a phase and it will pass. In the mean time, I wouldn't force attention on her. Barely acknowledge her. Go about putting away your stuff as you would normally, and let her come to you for attention.