Of course she can. She is eligible to apply as long as she meets the following requirements:
You must be married to or in a recognised civil partnership* with the Irish citizen for at least 3 years
You must have had a period of 1 year's continuous reckonable residence - see below - in the island of Ireland immediately before the date of your application, and during the 4 years preceding that, have had a total reckonable residence in the island of Ireland amounting to 2 years. Altogether you must have a total of 3 years reckonable residence out of the last 5 years.
Your marriage or civil partnership must be recognised as valid under Irish law
You and your spouse or civil partner must be living together as a married couple or civil partners
You must be of full age, good character and intend to continue to live on the island of Ireland
You must have made a declaration of fidelity to the nation and loyalty to the State.
See here:
http://www.citizensinformation.ie/en/mo ... riage.html
She could have applied years ago.
