Yes we have had similar Poll, and it drove us mad too!
Youngest was sounding like an old man, sort of groaning instead of properly exhaling, and especially when he was eating
It was just a habit. I asked him if he knew he was doing it, and he said no (I'm sure he did!). So I said, well, now you know you are, try and be aware of it and then you can stop.
It took a while but he did, thank goodness.
Now, I'm sure it could be something to do with worrying, but not necessarily. I developed an odd habit of sort of raising my eyes whilst lowering my eyebrows when I was about 6 (?). I think it was just because I could
But I was taken to the opticians and all sorts - there was nothing wrong, either physically or emotionally
On the money worries, Amy is just a child, she doesn't really understand about money and budgets. It's fine to mention that you can't necessarily buy quite everything she'd like you to - after all a list for Santa should be a wish list, not a shopping list - but also maybe let her know that's not necessarily a bad thing. If you get all you want, it doesn't mean anywhere near as much as if you have to wait a while and save up for it.
But to someone Amy's age, if you say money's tight they will imagine being on the streets, without food, no Christmas presents at all - that's how children are
Just as, if you said, ooh I've got a bit extra - they'll assume that means new xbox, 60" Tv, the lot