The American, who shot an incredible nine-under 63 in the first round, had a lower-key second but managed a birdie and an eagle, with a couple of bogeys levelling her out.
South Korea’s Lee, meanwhile, hit four birdies in a row on the back nine to end with a 67.
Paula Creamer, the 2005 champion in France, also shot a 67, while Inbee Park managed a superb 64. Both sit three shots off the lead.
Cheyenne Woods, Tiger’s 23-year-old niece, made her first professional cut with a 69 that gave her a tie of 18th.
"Today was actually a little bit of a struggle for me,” Lewis said. “I wasn't really sure how I would play coming off a good score yesterday.
"It's hard when you make pars and you feel like you're going backwards because of all the birdies I made yesterday."
Woods said: "I'm so excited. It feels so good, one, to be out here in France, and then to play so well and finally make a cut."
World number one Yani Tseng missed her second cut of the season at three over, following her disastrous opening-round 76 with a 71.
Defending champion Ai Miyazato shot 70 and is nine shots off the lead.