yup it makes sense, notice in CoD, time travel is confirmed
possible and existant in the lore. So Charlotte after POR is definitely crafty enough to invent time travel a year later. and since she is the only character cooler than Alucard and Trevor, she's definitely the only one who can defeat Dracula once and for all!

It's a definite that Charlotte would master magic and alchemy in a flash and surpass the need for the vampire killer and glyphs and other stuff!
Yeah Julius is powerful, but I'm sure the twist in 1999 is that Belmonts can in fact not finish Dracula once and for all, they can only stop him for a time. So the key lies in Charlotte's awesomeness to save the day!

and remember St. Germain is only an observer. he works under Charlotte definitely cause no one is smarter and cooler and hotter than Charlotte Aulin!

well maybe Shanoa can rival that but I have a feeling Shanoa will be seduced by Dracula's power and become a loyal succubus.

well at least in one of the endings and stuff.