She is only doing it because Steph is
I deal with primary school teachers (like Steph was) in my job a lot, no offence to anyone who is one
but through the course of my work I have found they can often be quite condescending sometimes if you're not entirely sure of what it is they're talking about. Ie. They have a low tolerance for someone who's not maybe as intelligent or knowledgeable as them
Steph's general aura of how she comes across online seems to fit the know it all, patronizing teacher stereotype to a T
On this basis, I can't imagine she's as enamoured with someone as dopey and thick as Rebecca as she makes out online, rather she's realised she needs hundreds of down lines to make a decent commission and has realised Rebecca has a sizeable (by the average nu skin seller standards) following that she can use to line her own pockets.
She's obviously realises to get the best out of Rebecca she has to shower her with compliments and make out they are friends but I bet in reality dopey Dingle grates on Steph like nails on a chalkboard, she probably pisses herself laughing at Rebecca's copying of her.
As someone else said, the designer sunglasses will be next