The former England under-23 international signed a new deal with Palace in September 2023, having recovered from an anterior cruciate ligament injury.
Starting out at Chelsea's academy, Sibley signed professionally with Crystal Palace in January 2022 following four seasons in the US with West Virginia Mountaineers.
She linked up with Becky Langley's Magpies in the summer of 2024 for their first campaign in the second tier following promotion.