Nicollet, who has been recovering from injury and erratic form, made the cut despite a double bogey and a bogey on 16th and 17th hole yesterday.
She is now three-over 149 at the National Golf Club par-73 course. The cut fell at six-over 152.
Nicollet, who had three birdies and four bogeys in the first round, had two birdies and an eagle in the second against four bogeys and a double bogey.
Long-hitting Nicollet made good use of the distance she manages off the tee and the eagle on 14th helped her cause.
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With overnight leader Carlota Ciganda a stroke back on three under, the leader board is packed with long hitters who have cleverly plotted their way around the tight-tree lined course.
Fellow Spaniard Ciganda recovered from a double at the 12th and two bogeys with three birdies to stay in touch.
Johnson fired a second round two-under-par 71 after holing a wedge shot for eagle on the par-five 15th mixed with birdies on the sixth and 18th against bogeys on the first and 17th.
Davies, playing with a local caddie, made five birdies and, despite bogeys on one and five, her birdie on the tough par-four 18th saw her move joint top.
Alonso overcame a double at the eighth and three bogeys to shoot six birdies including one at the last to share the lead.