Bella had slept. A lot. She was surprised Voldemort had let her sleep that much. But apparently he realized she was no good to him when she was exhausted. And after all she'd been through, she deserved a little rest. Being dead wasn't as refreshing as one might imagine. No, Bella felt worse than she had before she'd died... and considering they were in the middle of a battle when she was killed, that wasn't top notch either. No one was more surprised about her exhaustion than Bella.
But eventually she woke up. Bella showered and pulled her hair into a tight bun at the nape of her neck. The she grabbed her cloak and tucked her wand up the sleeve. Years of practice had gone into using that specific placement to make it easy to access her wand by drawing it into her hand magically. If it wasn't there she stuck it in her cleavage, and that was never quite as convenient. Not having access to make-up or anything like that didn't really bother Bella, she normally went au naturale unless there was a reason not to. At the moment her thoughts were just more focused on getting to her sister.
Bella didn't ring the bell when she arrived. She didn't wait for the house elves. And she definitely didn't bother with whatever formalities she'd been taught. She pushed through the door and used her rather exact deductive reasoning to find her sister (she passed through two other rooms before finding Narcissa, but no one need know that!). Nudging the door open, Bella thought about saying something first, but didn't bother. She walked right up to her sister, grabbed Cissy's arm and yanked up the sleeve.
"Oh bloody fucking hell, Narcissa." She wasn't really angry at her sister, she was angry in general. She'd already said her piece to Voldemort about it (as much as she would say to him anyway). She was just furious. She had been very specific in the past years that there was no reason that her sister should ever be marked. And here she was... bloody fucking marked!