(HLNtv.com) -- George Zimmerman's wife apologized to Trayvon Martin's family in an interview that aired Thursday on ABC's "Good Morning America." She also hinted that her marriage to the former neighborhood watch captain is in jeopardy.

Shellie Zimmerman has kept a relatively low profile since July 13, when her husband was found not guilty of second-degree murder in Martin's February 2012 shooting death. Thursday on "Good Morning America," the 26-year-old nursing student said she is "going to have to think about" staying in the marriage.

The interview aired a day after Shellie Zimmerman pleaded guilty to perjury for lying about the couple's finances during a bond hearing for her husband in April 2012. Prosecutors say she told a Florida judge the couple was broke, when they really had $135,000 from donations in the bank. As part of her plea deal, Zimmerman will spend a year on probation instead of serving prison time. She also will perform 100 hours of community service and write a letter of apology to the judge who caught her in the lie.

"I can rationalize a lot of reasons for why I was misleading, but the truth is I knew I was lying," Zimmerman said in the interview with ABC. "I wish a lot of things were different. I can't tell you how many times I have laid at night saying, 'God, I wish these circumstances had been different.'"

Zimmerman also expressed her feelings toward Martin's family.

"If I could speak to them I would say that I'm deeply sorry for their loss. ... I can't even begin to understand the grief that a parent experiences when they lose a child," she said.

Martin was 17 years old at the time of his death. He was walking, unarmed, through the Zimmermans' neighborhood on February 26, 2012, when George Zimmerman saw him and told police that he looked suspicious. The two got into an altercation, and Zimmerman said he was forced to draw his gun and shoot Martin in self-defense.

The public outrage over Martin's death pushed the Zimmermans into hiding before the trial. Shellie Zimmerman said they were in constant fear for their safety.

"I think we have been pretty much like gypsies," she said in Thursday's interview. "We lived in a 20-foot trailer in the woods scared every night that someone was going to find us and that we'd be out in the woods alone and that it would be horrific."

Zimmerman also told ABC how she feared for her life immediately after her husband's not guilty verdict was read in July.

"The deputies were so afraid of people shooting into the windows of the courthouse that they were pushing us up against the wall so that we couldn't be seen by the people outside, and that was really scary because at that moment it became very real," she said. "It's been real this whole time, but that was a distinct moment for me that I'll never forget, being pushed against the walls and thinking at any second, my life could be over."