I've just stopped trying to date and trying to be a friend, but that's still hard because she's feeling so depressed lately.
It's good of you to be supportive, but, ultimately, the main solution to her depression is to increase her level of awareness of how she is resisting something(s) in her life experience (consciously &/or subconsciously) and subconsciously generating emotions from this resistance. It's a chain of thought, much of which occurs in the subconscious domain, so emotions
seem to 'appear' out of nowhere, and the person doesn't know how to stop them occurring or how to improve their emotional state.
I've already discussed this stuff, earlier in this thread, and some readers got shirty about it, so I won't repeat it here, but suffice to say that no other person (including you) can solve her depression, but you could help her to move towards an understanding that she needs to increase her awareness of her subconscious thought processes, and perhaps assist her in actually doing so (provided she has no history of epilepsy, binaural meditation soundtracks can be helpful, and to a lesser but still worthwhile extent, so can Cognitive Behavioural Therapy / CBT).
She should also ensure she is eating a nutritious diet with sufficient iodine, magnesium, zinc, selenium, etc.
Certain food
sensitivities can also lead to clouded thinking and poor memory. Gluten is one example, if you happen to be sensitive to it.
Also consider that certain toxins (e.g. mercury, lead, copper, halogens, etc.) can influence the function of the endocrine and central nervous systems, so it may be worth testing for these. You would be truly astonished by how
profoundly such toxins can affect a persons physical and/or mental health. There is also a strong link between certain toxins damaging the bacterial ecology of the digestive tract, and because many of the health-promotive bacteria that live in the GI tract of a healthy humanbeing actually produce chemical compounds that support healthy neurotransmitter production, a GI tract with an imbalance of such bacteria may have an unexpected influence upon the neurological health of a person. There is a specialist (Dr Natasha Campbell-McBride) in Cambridge, UK, for example, who has had great success with treating poor GI tract health in her patients (many of them children) and who has seen remarkable improvements in their mental health (even including those with autism).
The problem is that no one practitioner will be specialised in Psychology, nutrition, and environmental medicine. Furthermore, the standard modern approach is to suppress symptoms through the use of pharmaceutical drugs, rather than check for other possibilities. So finding out which thing(s) may be influencing a persons chronic state of mind is often not easy. (I've worked in the mental health field for a number of years and seen many people fobbed off with medication rather than a deeper approach being considered).
It is complex, and there's no denying that.