Thanks for your query.
There are various causes of boils on the clitoris
One reason could be recurrent infection of hair follicles, or a persistent infection for eg. yeast etc.
suppuritiva is a disorder where the glands get blocked leading to recurrent boils
She could be injuring or abrading her clitoris with her nails etc, leading to infections.
Certain cysts on the vagina become infected and present in this way.
She should have a thorough check up with a reputed gynecologist for the exact diagnosis, and treatment accordingly.