If the prosecution actually needed Olivia Jade’s testimony to prove the case against the parents they would never have charged the parents in the first place. The case against the parents will be proved through the testimony of the cooperating witness, wiretap evidence, and the paper trail on the money as well as the fake photos and applications submitted and correspondence to and from the parents with the cooperating witnesses.
The real possibility of Olivia Jade being prosecuted will be used to extract guilty pleas. Although she was complicit in the scheme the strategy was to go after the leaders and use the threat of prosecutions on those who were complicit.
Criminal defendants do not get to pay their way out of a prosecution and the US Attorney stated very clearly in his press conference there will not be one system of college admissions for the wealthy and another for everyone else, nor will there be a different system of criminal justice for the wealthy, although the reality is that they can pay more money on their legal defense. The chances of payments to charity getting rid of these cases are zero.
That may be a solution in the civil cases however, and those cases coule have the same result (establishment of scholarships or funding of scholarships for those who need them).