Given how wrenching to one’s identity throwing off the Hasidic way of life can be, she said, “suicidality is really an issue that haunts many of our members.”

The causes of suicide are complex, experts say, and it seldom can be attributed to a single event. Ms. Tambor did not leave a note, and the official cause of her death is awaiting toxicology tests.

Even before she divorced and had to work out custody arrangements to see her children, she had a troubled history that included depression and, according to friends, sexual abuse by a relative. But Ms. Tambor’s friends and supporters say her alienation from her children weighed most heavily, and for that they blame her family and the rest of the Hasidic community she left behind.

A spokesman for the sect would not comment and another did not respond to messages.

Ms. Tambor’s ex-husband, Moshe Dirnfeld, declined to comment.

Yeedle Melber, a cousin of Mr. Dirnfeld, said close family members had told him that Ms. Tambor began to have mental problems several years ago after she was struck by a car. There followed an attempt to take her own life during the marriage and hospitalization for five months at Rockland Psychiatric Center.

“She became unbalanced,” said Mr. Melber, who is Hasidic. “Her husband tried everything in his power to hold things together. She started going in a bad direction. There was a feeling the kids are not safe with her because of mental issues.”

Image Ms. Tambor, 33, had forsaken the Hasidic Jewish world.

But Mr. Weiss and friends of Ms. Tambor said her psychological issues had been exacerbated by the way she was treated. One friend, Shulem Deen, a divorced father who had also left the Skver sect, wrote an essay for Tablet comparing Ms. Tambor’s ordeal to his own estrangement from his five children.