Narcissa Malfoy; just like marie antoinette (damascene) wrote in darkmarx,
Narcissa Malfoy
Intangibly, no. Bella has always been very strong minded and typically believes she knows what's best. Although I can sometimes get her to do something she doesn't want to if I ask, my sister is not someone who can be controlled or mediated when it comes to impulses, not even out of consideration for family. She might, perhaps, feel guilty over having inconvenienced me in the aftermath, but the forethought to act contrary to herself when she's in the moment is unlikely to occur.
And of course Bella and Lucius have never gotten along very well so I highly doubt she'd be inclined to put him before herself in any venue. And I honestly can't say I'm sure of the full extent of her affections for Draco.
But if it came to my life or safety I don't have a single doubt that Bella would put me before herself. Even if the entire world was burning, I wouldn't be afraid for myself if my sister was with me.