How to train abused miniature schnauzer?

hi, my family recently got a mini schnauzer and we found out after buying it that it was abused by the previous owner. but we decided to keep it anyway. its been about three or four days and improvements have been made but i was just wondering if there was anything we could do to speed up the process. she is very hesitant to come inside from our back yard, and also hesitant to leave the dog bed we have set up in our family room. she cowers from anyone who steps toward her and does not like to be cuddled with. she does not like to leave her cage either. whenever you want her to go someone you have to pick her up and take her there. she rarely plays with the other dogs and it is becoming more and more seldom. if anyone has any sort of helpful advice that would be terrific