Questions & Answers about Il destino cambia, ma lei non lo percepisce.
Does lo here replace the masculine noun il destino or the whole first clause?
Is the explicit subject pronoun lei strictly necessary here?
Why use percepisce instead of a simpler verb like capisce or nota?
Percepisce comes from the -isc- verb percepire (to perceive or sense). It highlights a lack of subtle awareness or intuition. Capisce (understands) would imply she doesn't intellectually comprehend it, while nota (notices) would suggest she misses a more obvious, observable sign.