...Having that experience, she should withdraw all her cryptocurrencies there and store it on a non-custodial wallet. It's more safe there than keeping it on a CEX.
As I wrote earlier, money was deposited on OKX not for storage, but for trading. Accordingly, after unblocking, they continue to be used for trading. But at the same time, it must be remembered that what exceeds the required volume for trading does not to be stored on the exchange. And this rule must be followed not only for OKX, but also for all other exchanges.