Traditionally Familiars aren't physical pets, they aren't even pets at all, they're a Spirit a Witch works with, some practitioners believe you can make a familiar, others believe they are already existing spirits.
'She does the things familiars do...' So she assists with spells, provides spiritual protection, goes out and completes certain Metaphysical/Spiritual requests of you? Also Kittens, bless their little cotton socks are always so cuddly and dependant because they're babies (Toddlers).
A Ritual to make her your familiar? I doubt you could get her to stay still for long enough, also since traditionally Familiars are spirits and not physical entities; I question the rituals you'd do very heavily.
To your final point, look into Vampire folklore, and energy vamprisim, that is about the closest you can get to Vampires in this day and age. There are no real vampires.