A badge that says “verified” is worth only as much as the check behind it. Here is exactly what happens before a profile is shown, and what the date on each profile tells you.
When she signs up, the advertiser confirms that she is over 18 and that the photos are of her. The profile stays hidden until a moderator has looked at it and approved it.
Each new photo is matched against the photos of all other profiles on the site. If the same picture shows up elsewhere, the moderator sees it before deciding.
Every profile shows when it was last checked, and the check has to be repeated every 90 days. If it lapses, the badge drops a level on its own. Profiles that also passed a video call are marked separately.
If something on a profile looks wrong, report it from the profile page; reports are looked at within 24 hours.