Summary
According to the in-depth investigation, there are multiple documents available to Der Spiegel, many of which are signed by Ronaldo, that prove that this **** incident happened.
In one of the documents Ronaldo is quoted saying that "She said "No" and "stop" multiple times" and that he fell on his knees after the incident, begging for forgiveness: "I'm a good guy 99% of the time, I don't know what's up with this 1%."
DER SPIEGEL is one of the, if not the highest decorated newspaper/magazine in German, maybe next to Die Süddeutsche. They played a massive part in uncovering the Football Leaks scandal in 2017 and are a very trustworthy source.
As for why she's only now coming out with this story, she lists three reasons:
1. She has a new lawyer that claims that she couldn't be sued if she speaks up about this, despite taking the money out of fear in 2009.
2. The overall climate has changed, ****-victims are trusted more ever since the MeToo campaign. It's also become more difficult for rapists to downplay claims.
3. She wants to know whether other women have also been sexually assaulted by Ronaldo.
Overall, the evidence is damning. First reports of this emerged in 2017 during the Football Leaks scandal, but back then Der Spiegel didn't succeed in getting the woman to open up about this. More evidence apparently emerged since then as well.
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This tweet is from one of the authors behind the latest DER SPIEGEL articles about CR7
Basically what it sais (rough translation/ summary):
There are 2 questionnaires
In one (from December 2009) Ronaldo answers that he did have consensual sex with her.
In the second one (from September 2009) which was send from a lawyer of Osório de Castro's chancellery to Osório and his colleagues, Ronaldo answers the question if she did scream or got loud during sex as followed: "She said stop or no several times. She said that she doesn't want to, but she has made herself available. Afterwards I apologized. But she never screamed."