so depending on the plot instead of meeting him outside, she could meet him inside, they talk dance, he invite her to a private place, she comes with him, but he is a vampire hunting for blood and now she is his victem.
so if she turn to a vampire, there can be many reason, in some versions, they have to drink the vampires blood, in some they have to die, in other a bite alone is enough, though I dont like the last one since, that would fast make a lot of people vampires.
lets say they have to drink two times a mounth. thats 24 vampires in a year for one person, and those vampires have to drink too, so that is 25 vampires drinking 2 times a mounth, that is 50 more vampires. so I wouldnt go with a bite alone, I think the vampire drinking too much and shes dies, and when you die with vampire poisen in your body you become one.
Now I don’t really know depending on how you have your plot, so it could either be bloodlust that the vampire needs blood or is thirsty that the vampire maybe havent drank from a human in a while or just didn’t want to?