There is a large subset of romantic cards specially dedicated to marriage proposals and wedding imagery complete with wedding scenes, diamond rings, and on-bended-knee poses.
On the other hand, if she prides herself on being unique, the classic on-bended-knee proposal may seem too cliché or predictable for her tastes.
For many people, the traditional on bended knee proposal is tame and predictable, and they prefer more creative marriage proposals.
Consider proposing on bended knee on a beach or in a favorite nostalgic place - perhaps the scene of a first date or kiss - at sunset or under the stars.
For example, give the ring in a more casual or creative way rather than on bended knee.