do you honestly believe these threads exist solely to give advice to the initial poster? They are read more widely and it matters what people say on them.
If inappropriate, exclusionary language isn’t called out, people will continue to use it. By your standards it would be fine to use a racial slur to describe someone on the internet because ‘it wasn’t to their face’.
Apart from the bite marks (which could be as harmless as chewing a pencil, which plenty of people do), none of the behaviour is ‘fucking odd’.
Talking or singing at inappropriate times isn’t odd - and plenty of kids do it when they should be quiet - see also adults humming, whistling, playing music or videos out loud. Annoying, yes, but odd? No.
Chews everything - like what? Pens and pencils - annoying if they are school ones, but not odd. If she’s chewing the table, then that’s odd - but as the OP doesn’t say that, I’m going to assume she’s not leaving marks on the furniture like a puppy.
Constantly talking about bugs - why is that odd but talking about mythical horses with horns and magical powers isn’t? Because Rainbow Dash is pretty and beetles aren’t? Or is it because society has decided what is ok for girls to obsess over?
Asking if her friend has started her periods isn’t odd - it’s totally normal for girls to discuss this momentous time in their life. It could be that she’s finding the transition to adulthood scary and wants to be able to discuss it with someone who has also experienced it.
The use of words like ‘odd’, ‘strange’ and ‘bizarre’ are a way of describing behaviour in order to garner sympathy. OPs daughter doesn’t have to be friends with anyone she doesn’t want to be, but as a member of society, she bears responsibility for being inclusive and kind - we all do, and part of that is not upholding cultural norms that exclude people with differences.