I think it's extremely poor form on her part, and I definitely wouldn't buy from or swap with anyone who did this.
I went back through recent postings on the swap board, and found the products (and NCer) you're referring to. There is a HUGE disparity between what she paid and what she is now charging: a 43% markup, to be exact. A few bucks to cover shipping, OK, but this is inexcusable!
Just my two cents, FWIW.
When the power of love overcomes the love of power, the world will know peace. - Jimi
2c/3a, BSL, medium, low porosity
Co-wash: Eden Bodyworks Coconut Shea
Low-poo: Bobeam and CV poo bars; Acure Argan Oil & Stem Cell
Conditioner: Acure Argan Oil & Stem Cell
Stylers: As I Am Leave-In conditioner
PT: SSI Okra; CJ Repair Me; BASK Whiskey Soak