She can create the items but it doesn't say anything about her being able to give them the effects that they have, so I doubt they came from her skill.
They'd have to discover if Nagi can cure people too, which I think they could do just by having him touch a zombie considering what Yuu touching them does. If it doesn't work, then only the femboy zombies have a chance of being cured.
We have art up to volume 9, so I'm guessing this means there will be 10 volumes total once the last one comes out. Assuming I'm correct, we have at least 4 more volumes to look forward to since we're close to the end of 6 which I'm happy about.