German Shepherd Puppy 2 months old?

i have a 2 month old german shepherd puppy and she bites. HARD. she made me bleed at least 4-5 times. When she even touches me with her teeth, i yelp and she goes away. For about 5 seconds. then she comes back and attacks me again. I have to put her into solitary confinement for about a minute, then i take her out again and she goes wild about a minutes later. what do i do? I tried the water spray, the water vinegar spray, but she attacks the bottle. Also, when can a dog do obedience training?