You cannot love her enough to complete her.
Her condition sounds serious which necessitates professional care, perhaps including medication.
Unfortunately, if she does not receive help her behaviour will likely worsen and affect her relationship with you as well as her ability to perform at work.
Therapy will help her find out what she needs and instead of believing the world needs to give this to her and then becoming angry with everyone for not loving her unconditionally and understanding her, she must learn to give this to herself.
Depression is just like any other disease that grows when untreated. Also the deeper someone becomes depressed the harder it is to change their neurochemical imbalances. Some psychologists are open to accepting reduced rates payments. Otherwise you will need to approach government hospitals, or wait for a suicide attempt to gain emergency admission. Please phone SADAG for more concrete support for those who cannot pay to see a professional. 011 262 6396.