People on the show's set are concerned about Winter's well-being and have been sneaking her food, according to in-court statements by Gray's attorney, Michael Kretzmer.
"Not for one second is this the picture of a rebellious teen," Kretzmer said during the hearing.
Gray's filing states Chrisoula Workman has repeatedly slapped Winter and engaged in emotional abuse, including name-calling.
"The allegations made by Ariel are false," said Gumm. "We really feel she's just a rebellious teen and wants her independence. It's our hope that the court terminates the guardianship. Both parents want Ariel home. Shanelle is not suitable to be a guardian."
Guardianship cases in California are public record. Attorneys for Winter's sister requested the case and its proceedings be sealed, but a judge refused. The case was filed under Winter's birth name, Ariel Workman, in part to avoid attention.
Although The Associated Press does not generally name underage victims of abuse, Winter's name is being used because it is included in the public guardianship case.
Glenn Workman's filing Monday does not address the abuse allegations, but it states he believes his daughter should be returned to live with Chrisoula Workman, or that he be allowed to raise her.
"I want to provide for her a calm loving home environment that is a retreat from the glitz and glamour of Hollywood; a place where she can think and relax without any distractions," Glenn Workman wrote. "This whole situation has turned into a circus and places Ariel in a position she should not have to be in."
Winter's credits include appearances on several TV series, including "ER" and "Phineas and Ferb," and movies such as "Kiss Kiss Bang Bang," ''Ice Age: The Meltdown" and "ParaNorman."
Anthony McCartney can be reached at http://twitter.com/mccartneyAP .