AW are auto removing (hiding all content) if a new profile is not verified in about 48 hrs or so. I think this is done to remove the deposit scam profiles that are appearing in the dozens every day. At least it keeps the Nigerian scammers busy creating 'new' profiles and recycling photos from the profiles that have been removed. Its a worldwide scam, not just limited to AW, as confirmed by a mate of mine in the US where the number of fake profiles has also increased.
I think this is more about age verification, about which (for obvious reasons) AW has to be very careful.
After a new profile is set up, the girl in question has, as you say, around 48 hours to provide verification.
An oddity is that, while a downgrade to "content-only" is the most common outcome if verification isn't provided, in some cases the profile is removed completely - and in a few cases the complete profile is able to remain in place permanently, while remaining unverified.
Incidentally it's still possible to exchange e-mails with a girl whose profile has been downgraded. So, if she's genuine - and quite a lot of "downgraded" profiles
are genuine - you can arrange to meet the girl in question if you want to.