(CNN) A federal appeals court has rejected an effort by former Army intelligence analyst Chelsea Manning to be released from jail following a court holding her in contempt last month.

Manning was jailed last month for refusing to testify -- likely against WikiLeaks or its founder, Julian Assange -- to a federal grand jury in the Eastern District of Virginia.

She has been in jail since March 8.

Manning had argued her rights were violated by the grand jury subpoena proceedings and has accused the federal prosecutors of misusing the subpoena to entrap her.

The former Army intelligence analyst who was previously jailed for seven years for leaking classified documents to WikiLeaks was subpoenaed in March to testify. The grand jury activity was apparently the latest dust-up from the Justice Department connected to Assange and came weeks before Assange was arrested in London.

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