She refuses to surrender to fate; she insists on changing her own life.
Tips
usage
The 宿 here is read sù — the 'former, prior' reading — not xiǔ (night classifier) or xiù (constellation). The literal sense is 'fate fixed from before [this life]', echoing the Buddhist idea of karmic causation across lifetimes.
culture
Carries a heavier, more philosophical weight than 命运 ('fate'). 命运 is what happens to you; 宿命 implies that what happens was already determined before you were born.