Technically, pitch refers to one note, a single sound within the whole range; a high pitch would refer to a note in one of the upper registers. Being pitchy, of course, is not a good thing, being a little sharp or flat of the particular note that a singer is trying to produce. I believe what you are asking about are, more exactly, female singers with a vocal range that extends higher than normal.
This may not be your cup of tea, but she certainly gets up there.