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White Canary has her staff
Elektra has her Twin Tsik vai
Gamora has her blades


Who wins

Probably Gamora, seeing she also has enhanced stats, beyond her training. Sara has held her own against enhanced individuals before (like the one female Time Master assassin, who was flinging people around like ragdolls), so she could likely make her work for it though. MCU Elektra has been rather underwhelming up until this point.

I would rank them as:
1. Gamora
2. White Canary
3. Elektra

Gamora wins. Elektra falls first.