Cindy Chandler developed several relationships over the course of the series.


Cindy and Libby
First Episode: "The Other 48 Days"
Origin: Cindy and Libby were stranded together for 48 days after the crash of Oceanic Flight 815.
Since Then: Libby and Cindy spent 48 days together on The Island. They fished, took care of Emma and Zack together, and constantly moved around the Island. They found the Arrow Station and were the first Tailies to meet a fuselage survivor, when they saw Jin wash ashore. However, Libby also gave ominous glares at Cindy. Cindy disagreed with Libby to stop and rest for Sawyer while they were in the thickness of the jungle where The Others would come for them. Seconds prior to her abduction when they were climbing the ridge and aiding the makeshift stretcher being lifted to take a gunshot Sawyer uphill, Cindy handed Libby her grey knapsack and walking stick. Moments before this, the two gave each other synchronized nods before embarking upon the task. When Libby got pulled up by Ana Lucia, she apparently never looked behind her once for Cindy, who was right next to her. And when Ana called her name five times after they reached the top of the ridge, Libby took a long time to register Ana’s voice addressing the concern for her absence. It is left unknown why this was the case.
2x07 LibbyCindyLearnNews

Zach and Emma

Cindy and Zach and Emma
First Episode: "The Other 48 Days"
Origin: Following the crash of Flight 815, Mr. Eko asked Cindy to look after the children.
Since Then: Afterwards, she is seen with Libby comforting the children on the first night when the first three Tailies are taken. Once in the captivity of the Others, she is portrayed as the sole caretaker of Zach and Emma, and remains so for at least three years, when she is next seen at the Temple, as well during the Others' exodus with the Man In Black.