There was this woman who wanted me to join a business site and make my own business portfolio this a scam?

If you have to ask if it’s a scam, it’s a scam

Of course it’s a scam

Could be anything... but for her probably-unlawful benefit, not yours.

An anonymous "this woman" on a mere chat-group trying to recruit other users to an unspecified franchise in an unspecified line of work?

Yah