Many cats are very picky about how and when they are petted/held. This is my first cat that doesn't mind being pet all over his body (our other two girls tried to bite you if you pet their back and they were in a bad mood) but he still prefers the head. Cats seem to like being scratched under the chin, on the cheeks, and the top of the head because this is where their scent glands are in it helps to rub their scent on you, plus it feels nice!
And yes, sounds like she loves you if she is following you around and such. Cats don't go all out with their affection likes dogs, you can have a cat who loves you just as much as a dog, but just doesn't show it outwardly the same way! Cats are more, "I love you, but you have to understand I'M the boss!"