The phrase "administer herself" is correct and usable in written English.
It can be used in contexts where someone is taking control or managing their own affairs or well-being.
Example: "In order to achieve her goals, she decided to administer herself and take charge of her own health and fitness."
Alternatives: "manage herself" or "govern herself".
The obsessive mother who is the protagonist in "Dolly City" swallows antidepressants 20 at a time, administers herself electroshock treatments and carves the map of Israel into her infant son's back.
She was accused of unlawfully administering to herself noxious substances, namely the drugs mifepristone and misoprostol, with intent to procure a miscarriage for herself.
Dalton found that test doses of natural progesterone administered to herself and her patients brought swift relief from PMS symptoms.
The scenario Adams faced recently at her friend's house was her first time administering naloxone herself, after 18 months of volunteering and then working for the coalition.
Whosoever, being a woman with child, unlawfully administers to herself any drug or noxious thing, or unlawfully uses any instrument or other means, with intent in any such case to procure her miscarriage, shall be liable to imprisonment for ten years.
In the Anglo-Saxon period clerics with medical concerns collected a ritual (to be administered by herself) for the woman anxious to conceive a child and safely bring it to term.
And Mrs. Anderson reports that now, years after their three-month nightmare, hospitals actually encourage her to bring along her husband's medications and to administer the pills herself as his schedule demands.
A deaconess can help pastors and deacons, but cannot herself administer the sacrament.
Assisted suicide is when a doctor provides the patient with lethal medication that the patient will administer him or herself.
Later, when Ste leaves, Pauline has a fall trying to get the pill to administer it to herself.
