As someone who follows Kanatan's streams closely and understands Japanese, let me do away with a common misconception in the community (I know reddit is usually better than this, but if I convince even one person with this, I'm glad). Especially among people who only watch clips, there is a widespread belief that Kanata is on very bad terms with her mother.
Kanata does not hate Sayuri. Their relationship, while not perfect, is not terrible.
She calls her "Sayuri" rather than "mom" because of her resemblance to the Japanese actress Sayuri Yoshinaga, and to avoid confusing her with Oshio-mama, her character designer. Kanatan often mentions her during her streams when talking about various childhood stories. Viewers should understand that they are not giving Kanata support by hating on Sayuri, all they are doing is bad-mouthing her mother. A strict mother in a poor household without a father is not necessarily an unloving parent.
There is a big difference in opinions about Kanata's mother between Japanese and foreign viewers. While it's perfectly reasonable to think Sayuri is not the best mother, most seldom are. I would like it to be more well-known that not all of Kanata's stories involving Sayuri are bad but for some reason it seems only the bad ones get clipped. Those clips (mostly Iroha Translation's) are overly and deliberately anxiety-provoking, while leaving out context. Biased watchers then twist any quirky story involving Sayuri to fit their negative preconceptions.
As for Sayuri disliking Kanata's voice, yeah, that episode is quite bad.
However, the clip people commonly refer to (768K views, and the "I hate your voice. Don't speak!" in the thumbnail isn't said anywhere in the clip or stream) critically translates a part explicitely as "my real voice" rather than "a voice like this" when Kanatan is doing a high cutesy hamster voice.
Yes, Kanatan's cute/playful voice is on the higher side, hence her indignation at Sayuri's remark. But her (presumably) normal speaking voice she rarely slips into on stream is lower than that, see an example
here (at 40m 10s).
Kanatan being my favorite, it makes me sad to see mindless Sayuri bashing and misinformation being spread where Kanatan might even see it. Anyways, it's fine to dislike Sayuri for some things she did, and Kanatan knows how to keep her at arm's length, but please help correcting these wrong impressions when you encounter them.