Given that it's over 3 years since she recorded any activity, all the miles will have expired (For members without status, miles expire 2 years from the date of activity).

Section 2.4.3 of the Etihad Guest T&Cs allows them to terminate your membership after thirty-six months of inactivity.

The account is dead. Let it rest in peace.

Enrol anew and claim 1,000 miles as a welcome bonus.