Oh, yes, I think that is Frieda! I forgot about that signature part of the character and remember primarily the naturally curly hair. I am a giant Peanuts fan from my girlhood.
No, no, we didn't plan it that way--well, I didn't, anyway! But I thought to myself, "Migod, now she's got to read all these," and then the corollary was, "...and she'll probably reply to all these too, poor creature!" :D