The central probe agency identified the woman as Shivani Saxena, an "active" director of Ms UHY Saxena and Ms Matrix Holdings. Both the firms are located in Dubai.
She was arrested from Chennai, it said.
Saxena and her husband Rajiv are residents of Palm Jumeirah in Dubai, an archipelago which is home to the most expensive properties in the United Arab Emirates(UAE).
The lady, the agency said in a statement, was arrested under the provisions of the Prevention of Money Laundering Act (PMLA) and was later produced in a court which sent her to four days of judicial custody.
The agency said its probe found that AgustaWestland, United Kingdom "paid an amount of Euro 58 million as kickbacks" through two Tunisia-based firms.
"These companies further siphoned off the said money in the name of consultancy contracts to Ms Interstellar Technologies Limited, Mauritius and others which were further transferred to Ms UHY Saxena and Ms Matrix Holdings Ltd, Dubai and others," it said.
It alleged that both the Dubai companies of the couple "received the proceeds of crime in their respective Dubai bank accounts" from the Mauritius-based firm.
The agency is expected to probe and move for attachment of assets of the couple under PMLA.
The ED, in this case, had also arrested Delhi-based businessman Gautam Khaitan last year and he is out on bail at present.
The probe in the deal had gathered pace after a Milan (Italy) court sometime back sentenced Italian defence and aerospace major Finmeccanica's former chief Giuseppe Orsi and AgustaWestland CEO Bruno Spagnolini on corruption charges in the sale of these helicopters to India.
Post this, the ED and the CBI began a fresh round of questioning of the accused in this case and collection of further evidences.
The ED had registered a PMLA case in 2014 and had named 21 people including Tyagi in its money laundering FIR.
On 1 January, 2014, India scrapped the contract with Finmeccanica's British subsidiary AgustaWestland for supplying 12 AW-101 VVIP choppers to the IAF over alleged breach of contractual obligations and charges of paying kickbacks to the tune of Rs 423 crore by it for securing the deal.
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