Withdrawal is complicated and depends on a wide range of factors, including how much she was taking, how long she was using, how she has been weaned off and her own body / metabolism. Unfortunately it is almost impossible to give a time-frame, which I know can make it a lot harder. Most symptoms usually resolve within 2-3 weeks but it can be longer for some people. Is she working with a doctor around it? They can probably give advice and help with symptom management if necessary, especially around the diarrhea if it is a big problem for her.

I'm not sure about tramadol sorry. Have heard of it but no experience with people who are using it especially when going through withdrawal.