I've seen plenty of profiles where the girl prefers to communicate by text or WhatsApp, so she asks for people to include a number in their initial message when contacting her, to save messing around.
What's the well-documented scam? Literally just collecting random guys' numbers and texting them with blackmail threats? And expecting them to send her money, even though she's no clue who they are, what they look like or where they live?
I mean if that worked, you'd be even more at risk of it from every girl you ever met up with, so I don't see any extra cause for alarm from this profile in particular.