I don't believe ova are specifically referenced. The rejuvenation process is described in Misspent Youth as being based around resetting DNA from the individual to a younger age, and then vectoring it in to every cell in the body.
Researchers were aiming for the ability to vector new and complete DNA
strands into every component of the human body. It was DNA copied from
the patient, then engineered back to the state of late adolescence,
before they began losing telomeres and suffering replication errors.
There is clearly something more to it than that, as the end result is resetting the body entirely to a younger age, which a simple DNA reset of each cell would not achieve - excess weight is lost, hair follicles are restored, lost teeth regrow, etc.
Jeff Baker grinned at himself, revealing teeth that were perfectly
straight and white.
It seems that the technique is based on a DNA reset, but the full technique then uses the 'young' DNA as a template to restore the entire body to a younger age - including ovarian follicles.
In the Commonwealth novels, rejuvenation appears to work as a reverse aging process - it takes time to reset to any given age, and less time in rejuvenation will take less years off as described in Pandora's Star:
He’d returned from his partial rejuvenation on Augusta having had
about fifteen years taken off his age.
So again, it's not a simple DNA reset - there is a process that gradually reverses the impact of aging, with nothing to suggest it would not work on ovaries as well as any other part of the body.
The Dreaming Void makes a similar claim for biononics:
the body doesn’t age biologically after you hit twenty-five.
Again, it doesn't just claim lack of cellular ageing, but no biological ageing - with no distinction between the ovaries and any other part of the body.