Look i like this story and all but... Isn't she basically only a vampire in name and nothing else?...
the writer basically took every thing a vampire is and was like: Meh, she just sucks blood... or eat pancakes whatever comes first.
What vampires "are" are often rewritten to fit the narrative of a story. Some can shapeshift, some can't, some can do sun, some can't, etc. This one, so far, has demonstrated the "classic" unaging immorality, blood suckery, the ability to mind control, and the inability to cross sacred barriers. The author even helped us along by having the protag go through exactly what was real and what wasn't in their universe so we wouldn't all be wondering all the time.
So she just happens to only need a "top off" of blood every so often. Big deal. I mean, those pancakes looked REALLY good, so who can blame her? I'd move in too.