This set is from 1785, and she was aiming for things less lavish and luxe. The simplicity of the design as a whole describes this desire, the cornflowers seem to represent the aim for nature and its simple beauty yet at the same time are an exotic bloom (I believe from North America - correct me if you know anything on that). The pearls of course valued as jewels fit for a queen (Pearl Post Coming Soon!) yet they are jewels not shaped by the hand of a stone cutter, they are jewels in their most natural state.
This last image is the design of a different set she had, not on view at the Petit Trianon. It does give you an idea of designs Marie liked.