I actually looked up the real life characters. Apparently Marie is still in contact with both foster parents and has forgiven them. The really horrible one apologised but in a backhanded kind of a way from what I've read (quotes of hers) :
"She needs to realize at some point, and I think she does now, that-- OK, I hate to say this. But you know, I mean-- OK, now this is going to sound really bad, like I'm blaming the victim. But some of the way that she was acting was part of the reason why it had the outcome that it did. And I am not the only person that didn't believe her."
The other one at least apologised properly :
"I didn't want to say I was sorry over the phone, that I wanted to do it in person. So she came up. And we went for a walk. And I just took her shoulders, and I said, I want to look in your eyes and tell you from the bottom of my heart, I am so sorry I doubted you and I didn't believe you and we didn't support you. And she said that was OK, gave me a big hug. And I was just so shocked that she would be willing to forgive me for that because it was such a huge thing. And it went on for so long."
And also this is her take on the part where she saw the similar rape story on the news :
"Right away, I thought, I'm wrong. It actually happened. She was raped because this is too similar. So I immediately went in and called the Kirkland Police Department and asked to speak to the lead detective on the rape case. And I explained the whole situation about what had happened to Marie and that the Lynnwood police didn't believe her."
Unfortunately, as depicted in Unbelievable, Shannon's tip to the Kirkland police ended up going nowhere because of Lynnwood PD's insistence that Marie had falsely reported and the case was closed. "I was upset," Shannon recalled. "I thought there should have been more investigation, that it was just too similar." She tried to persuade Marie to go to the police a second time, but Marie was already embroiled in false reporting charges and was "terrified" of talking to the police again.
And yeah, I would say there are countless rapes where the victim is not believed because people don't want to believe it
Spoiler:
...it obviously didn’t touch on Marie’s story before her fostering ...but ‘specific promiscuous behaviour’ is not uncommon for girls, it’s how many childhood traumas can be manifested through adolescent years particularly...and yet her foster parents seemed to take these things as signs that she may not be being genuine...it was very odd...
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