A new and unusually large crop of female Republican candidates — many of whom have embraced President Trump as fervently as Democrat candidates have rejected him — hope to replenish the ranks, or come close. But the political headwinds facing Republicans and the districts that women are running in make that math daunting. “We have all this energy around female candidates, and yet Republicans could wind up with fewer women in Congress when all is said and done,” said Kristen Soltis Anderson, a Republican strategist.