>>662288She only uses Cover's own propietary Home3D, which is a bit of a problem because that clearly hasn't been updated in quite a while and only detects mouth movement when the IRL person does really exaggerated mouth movements
What needs to happen are two things:
1: finally update the program so that it has better mouth detection, it probably was not a priority during the time only Gen 0 (minus Suisei) used the program but nowadays more members are using it so the drawbacks of using it are more noticeable
2: update the model so that it has most of the Sora used in her previous costumes, as it is right now, both of Sora's alter egos are locked behind an older model and there's a complete lack of accessories, making it feel like they are in the first iteration of Sora instead of her 4th and it's making it look like her second costume (the one that was made one month after her debut) was far more polished despite it's being significantly more simple and lasting about as long as this one (just check the room she has while chatting, there are plenty of easter eggs of stuff she used to be able to wear in that outfit, nowadays she's been stuck to her default outfit for almost half a year)