The perils of reading instruction

I was working with a first grader today, doing a reading assessment. The sentence in the middle of the book was, "A girl asked Kate to sit with her at lunch." She's doing fine at the start, but then trips over "sit" and goes back to sound it out. She starts decoding with a "sh", and my heart drops a little bit. And indeed, she confidently reads through the sentence, "A girl asked Kate to sh** with her at lunch". Phenomenal. Had to keep the giggle inside, though.