If she was under investigation, the board would almost certainly bypass her for the interim CEO position, to mitigate the disruption if that investigation also turned out negative. (They might make her CEO after she was cleared, though, if it went the other way.)
Random question: do you have any connection to the Dragon speech-to-text software [0] that was first released in 1997? I've always found that to be an intriguing example of software that was "ahead of its time" (along with "the mother of all demos" [1]). And if so, it's funny to see you replying to the account named after (a typo of) ChatGPT.