Whether "No sooner had I seen her than I recognized her" is equivalent to the expression " As soon as I saw her, I recognized her" or " As soon as I had seen her, I recognized her." Would you mind explaining a bit more clearly?
Would "I didn't recognize her until I saw her" equate the expression in meaning "No sooner had I seen her than I recognized her"?
https://dictionary.cambridge.org/us/grammar/british-grammar/inversion https://en.wikipedia.org/wiki/Inverted_sentence