She actually started on Etsy, but it basically paid nothing. Perhaps, the markets are just extremely fickle, but he following is primarily on Instagram and Facebook. She's trying to break into Youtube just to increase exposure, which I think is going reasonably well.
Email is a very solid way of maintaining contact with the people who are interested in your products, so I would encourage her to put strong emphasis on building a list if she hasn't already.
This could be helpful in the event that another channel fails.
Yeah unless your product is super unique, you still need to market outside of Etsy is the vibe I get. That's good, yeah YouTube and IG are pretty good for those kinda things, not sure of some of the other ones out there that are common for influencers. Might be worth looking at where people are getting paid to be influencers on and that might be a trail worth following.