Should you question people in drug rehab?

My friend's mom is in rehab and she's been giving her the 3rd degree about everything that she did, why she did it, etc.
Is it good or bad that she's questioning her? Her mom really didn't want to talk about the past and wanted to talk about now instead.

: http://alcoholdrugstreatment.info/should-you-question-people-in-drug-rehab