The woman was arrested during a search in Kildare.
A third person has been arrested in relation to drugs raid in Mullingar on Monday.
A woman in her 40s was arrested during a follow-up search operation in Carberry, Co. Kildare yesterday.
She's being held at Mullingar Garda Station.
Two men are still being detained in Mullingar following the seizure of 301,000 euro in cocaine and heroin and six guns by gardaí at a house in the town.