She finds that mildly irritating for a whole different set of reasons, but it's such an improvement over the alternative that she lets it be. She's very careful not to seem as though she's taking advantage of her new-found position. She demands nothing, and makes only a few careful, diffident suggestions. This will not last forever; no need to burn bridges.
And of course, whenever she receives an email from the Slayer, she responds promptly.
"Is that jacket new?" Bella wonders loudly.
Also, who the hell are you and what's with the random question occurs to him, but he is distracted by the senior girl awwwing over his brotherly devotion.
"But I mean did he just give it to you?"
"Can I see it for a second?"
Bella makes a show of examining the jacket.
And she texts her sister.
Soph turns up. "What?"
"Just a thing. How're you doing, Soph?"
"Fine? What's up? Why do you have his jacket?"
Bella hands the jacket back to Scott.
"Hiiii, Scott," adds Soph, when he has possession of the jacket again.
"Soph, question. Scott was standing right there the whole time. You didn't notice him until I gave back his jacket. Why?"
"Huh? I noticed him. You're the one who texted me."
"That's not quite the - Scott, how long ago did you get that jacket?"
"Did you have a lot of girls hitting on you before you started wearing it?"
"Bella, is something wrong?"
"Let me see the jacket again. Soph - pay attention."
"Soph?" prompts Bella, once she has the jacket.
Soph looks at Scott.
Soph tells Scott:
"I think your jacket might be evil."