She may currently be behind bars, but Teen Mom's Amber Portwood is willing to do whatever it takes to maintain a relationship with her 3-year-old daughter, Leah.

Prior to being sentenced to a five-year prison term June 5 after opting out of a court-ordered rehab program, the troubled MTV reality star, 22, sought professional help at Seasons Recovery Center in Malibu, Calif. Entering treatment following a June 2011 suicide attempt, Portwood's time at Seasons is chronicled on her final season of Teen Mom.

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On Tuesday's episode, Gary Shirley's ex receives a visit from Leah and her father -- but their reunion doesn't exactly go off without a hitch.

Traveling from his home in Indiana to California to meet up with Portwood, Shirley is shocked to find out that a court order bans him from being in the same room with his ex and daughter simultaneously. "I brought Leah with me but I guess we can't be together," he tells Portwood in an emotional sneak preview from Tuesday's show.

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After a brief embrace, the couple part ways so Portwood can visit with her 3-year-old daughter. "This is where Mommy's been living for a while," Portwood tells the tot as the duo play outside on a swing set.

Despite her recent legal troubles, Portwood has vowed to keep up her relationship with Shirley and their little girl as much as possible while behind bars.

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Says Portwood, who also vows to get her GED: "I'm not just going to sit [in prison]."

Teen Mom airs Tuesday at 10 p.m. (EST) on MTV.

This article originally appeared on Teen Mom's Amber Portwood Reunites With Ex Gary, Daughter Leah in Rehab