So Long, and Thanks for All the Fish
What do you mean? I was not actually suggesting that the adventurers should do that.Because there is a high probability that they need to free her or do something significant for prisoner 13 in order to get the information. Talking to her like that 1) fails, and 2) alerts the prison that there is outside interest in prisoner 13, and 3) makes prisoner 13 suspicious of anyone in the future coming to "help" her.
Lawful good is not lawful stupid. Doing what you suggest is just dooming themselves to failure.