She has conjured a syringe of venom. There are no known effects relating to any particular person doing the turning, but she's gone ahead and duplicated her alt's venom - what would be hers, if she turned - regardless.
She hides it behind her back and smiles.
Some time later, when the venom's everywhere and Alice's vascular system (among other things) is being replaced with something venom-based, they are snuggling snugly.
He loves her, he loves her, he loves her. Everything hurts, he's pouring stars, and he loves her. He can just about barely feel where his hands and his nose and his cheek and his arms and his stomach are touching her, through the pain, and he loves her. She is perfect and amazing and she gives the best presents and he loves her.
[And I can stop worrying about that changing,] Bella sighs happily. [That being the other thing I had the Seer check.]
[...What, really? You're making me a vampire because you want me to be in magic vampire love with you forever?]
[No, I'm making you a vampire 'cause I thought you'd like it. But I wouldn't have if you weren't going to wind up stuck on me, since falling in magical love with people is an occupational hazard of vampirism and can't be ruled out for arbitrary possible people until the person in question has already been identified.]
[Hey, Lazarus, did you wanna come see the endgame of the Christmas present?] Bella inquires, squaring on some clothes that they've both been doing without for the last couple days. [It is incoming.]
"Lazarus is gonna come see the fireworks," Bella murmurs.
"Mmmmmnf," says Alice, grinning slowly. "I feel like I'm gettin' run over by a train. A train that's on fire. Love you, love you, love you."
Bella magics herself immune to venom and related substances and vampire bites, and kisses him on the mouth. He is not as warm and soft as he once was, but they can freely vary that whenever they like with magic, and he's not exactly unpleasant to kiss even like so.
[The habitable part of the moon,] Bella specifies. [Third floor, coming from the stairwell second door on the left.]
"Here comes company," Bella says, tracing a line with her finger from Alice's cheek down to his flailing heart.
"He's been pouring stars for the last three days, it makes him all affectionate," Bella says, smirking.