Of course they're all deleted or lost to time, I'm talking like 2012 or 2013 VODs when she was mostly a LoL streamer because you couldn't stream art. But you can see this reply from a vocal coach about the exact question here: https://www.quora.com/YouTubers-like-Lilypichu-Wolfychu-Megan-McCarthy-have-an-abnormally-high-pitched-voice-Is-there-a-certain-condition-disorder-that-causes-this

There's also a condition called Puberphonia, which is probably more likely the case(but just speculation), because again, natural registers for men and women aren't normally that high. For instance if you've ever seen James Charles stream, do you think that's just his natural register? He talks like that all the time so surely... /s