I know that there are women who are trafficked out there and apologies if I sound uncaring. Does this mean that anyone falling under 3 like me or 5 points on those might be looked at as trafficked until proven otherwise?.
I'm pretty sure that if someone asks whether you are trafficked and you turn around and say, "No, I'm independent, please sod off" (in the nicest way, of course), you aren't going to get dragged out and chucked into the Channel in the name of "saving you from sex slavery [and making politicians look good in front of more ignorant voters which is most of them]".
I think from that list of things to watch out for, the unhappiness of the person in question would be the most important for anyone to consider first. Also, anyone who seems frightened, of course! I think anyone interested in confronting trafficking would first assess those points, and their next step would be to talk (and listen) to the person they're worried about.
Someone bustling about being busy and feeling perfectly normal is not going to create a huge sense of alarm, I wouldn't have thought, no matter where they're from or how much money they don't save.
I always think it's somewhat ironic that so many people find it easy to freak COMPLETELY OUT about ALL WOMEN being in TOTAL SEX SLAVERY OMG! and yet every single day these same people walk past toilet attendants, cleaners, labourers etc, without paying them any attention despite the equally high risk of trafficking there. They might even be interested in the idea of hiring domestic staff that they don't have to pay much. Awful.