Thank you ckyman for your response. I appreciate it, and as for your question, I honestly have no idea, since Emma mentioned nocturnal I was actually hoping it would overlap the Astrid quest or might find something in the haunted house, but I am having enough difficulty with the Astrid quest as it is. Getting caught as soon as the quest begins.
Yeah, I was thinking that might be the case. Also not got through Astrid's quest yet with it taking me while to figure out you shine the light in the area to fill the bar and hide when she comes close. At least I think that it how it works, it is kinda annoying you can only try on a Monday (maybe some multiple attempts tokens would be nice so you could buy with milk coins or something)
In the Haunted House, you are supposed to hide (click text or hit spacebar) when she gets close. Though when she catches you get a couple of bonus CGs so worth getting caught at least once. To get the Vampire Spit keep the light on Astrid until the bar fills up. You need to do this 3 times and after this the Vampire will show up when you return to your room. NOTE - You do not actually get Vampire Spit here I think it is a visual bug, you get it on the 4th time of completing the Haunted House.
Regardless on the 3rd completion of the Haunted House, you can then tell Emma about Astrid in the district on Tuesday, you then need to enter the Petrol Station