Zaid Alsalami, Shaykh Dr Zaid Alsalami is an Iraqi born scholar, raised in Australia. He obtained a BA from Al-Mustafa University, Qom, and an MA from the Islamic College in London. He also obtained a PhD from... Answered 3 months ago

Bismihi ta'ala

As long as she is under the age of "ya`s" or shar'i menopause, then she must observe 'iddah, which for her is not three menstrual cycles, but rather three full months. 

In fiqh, a woman who is in the age of menstruating, but does not menstruate, she is referred to as mustarabah.  Of course, it would be a good idea for her to refer  to the specific view of her Marja' taqleed. 

And Allah knows best.