Besides the fact that she's not nearly as physically capable as the main characters and would be the most likely to get killed if she had joined them.

Why the HECK would The Master have himself Fed-Ex'd to the same church where that girl's dead brother's funeral was being held? Coincidence??? O_o

Apparently, vampire bodies DON'T explode into flame once they're killed??? Because otherwise, those vamp corpses strung up for display in broad daylight on Staten Island constitute a MAJOR plot hole big enough for The Master's coffin to spin around in.