While I liked her I have to say that her portrayal of the character - as any actor´s portrayal of any character - depended on what the script offered her and how the director chose to lead her.
The script offered her certain things:
- a certain defensive coldness in order to protect her inner sadness about her father
- initative (when she defends herself in the car)
- humour (when she turns down Bond at first in the hotel)
Afterwards, she is mainly the damsel in distress. She does protect herself again when she denies to follow Bond in London. But then its damsel in distress again who can´t wait to be reunited with Bond, not knowing what he is about to choose on the bridge.
So, I don´t see a lot that diffentiates her from previous Bond girls. Or what Seydoux could do differently from them.
In fact, her character is symptomatic for the whole film: lots of potential, great start - and then losing intent and courage.