Most floaters are okay with a decent amount of flow, but if there is water ending up on top of the leaves long term or they get pushed under over and over they will rot. Use a floating separator:)
She just went to the website and followed the steps for setting up a shop. Get clear photos for different angles. I guess the algorithms favor popular shops, so you might have to drive your own traffic until you make some sales. Compare prices with other shops and include shipping, she tried...