She’s not very good at editing sound, and doesn’t bother to equalise the levels so in the same video it’s all REALLY LOUD and then it’s really quiet. She also doesn’t seem to know about fading music in and out so if you turn the volume up for a quiet part then you’re likely to have your eardrums burst by the millionth rendition of The Dance of the Little Swans suddenly coming in with all the dials set to 11.not just you don't worry, she tends to slur a lot of sentences together in the same way I do when I'm drunk and it can be hard to tell what she's actually saying plus she sometimes does this faux whisper so you have to strain to listen and I think she speeds up her videos as well.
Not helped by the fact she can't explain things to save her life so I always mis understand what she's actually trying to do
I think there is an element of speeding up her voiceovers so that they sound higher and more child-like, but she also does that irritating thing that a lot of YouTubers do where they edit out all of the natural pauses in their speech, which just makes the whole video sound like one massive run-on sentence. It’s very distracting to listen to.