Keep in mind that Cindy is also struggling with her desire for expression and discover her talent, she feels trapped between not wanting her relationship to Wade to fail and a want to blow caution to the wind and make a go of the opportunities that life presents. My read is that part of Cindy's attitude towards Lena is, at least partially, a bit of envy towards their differences in that regard; that Lena has apparent talents that people around her praise and the freedom to express them freely and seemingly without consequence. She of course does not know much of Lena's monetary situation and the whole Seymour thing, leading her to make assumptions about Lena.
I do hope Eva plans to give us a proper chance to explore the dynamic between Cindy and Lena more from Lena's perspective in the future. To be honest, to me the whole cuckold drama with Wade is dragging out somewhat by now so I'd just appreciate any progression with Cindy.