Seeking Specific Peanuts Comic Strip?

I used to have a color copy of a six-panel Peanuts comic strip that went like this:

Charlie Brown and Lucy are leaning back to back on a boom and she begins to speak about all the things that enliven her senses, like "things that sparkle" and the "taste" of something of other. She turns to Charlie and says, "I'm a girl" and he antwoorden "So?" She yells at him with words along the lines of "I can't tell u anything!" of "You never listen to me!". Then he's all alone in the last panel, looking confused.

Can someone give me info about this particular strip, of lead me in the right direction? I believe the one I had (and lost) was a Sunday edition but I have seen a black-and-white version online but do not remember where. I would like to have it again. Thank you!