Oh Bubble, even then - "PPD" has so many causes.
Nutritional deficiencies come to mind first, because of the Post Partum nature of this. Our doctors are not very good at nutritionally supporting pregnancy. Then, there is the emotional side - was she supported through the pregnancy? Baby wanted by all?
This is a "late episode" for intrusive, "delusional" (I hate that word) thinking. Normally, it happens in late youth, early adulthood. That it waited until her 30's makes me wonder about the whole trauma.
"Europe" is a big place. There are some cutting edge "Spiritual Emergency" things going on in Europe - like the Open Dialogue in Finland. There is now a spreading use of this practice throughout Europe (but may or may not be close to your cousin):
http://www.opendialogicalpractices.eu/ - click around that site, it looks like it is available in Belgium and Czech Republic, and maybe more places now, as they are holding annual seminars trying to spread the practice.
Will Hall has a list of resources, here: http://willhall.net/opendialogue/
His own story is a wealth of encouragement:
(and he is a psychotherapist who does counseling by Skype!)
The other key phrase is "Spiritual Emergence" to describe those non-consensual states, where beliefs are not affirmed in the reality that everyone agrees to - but they are no less real to the person experiencing them:
One more place where alternate reality gets support in the real world is Hearing Voices networks, which started with Eleanor Longden in the UK: Eleanor Longden - The Voices In My Head
It is now available around Europe - they had a huge conference recently in the Netherlands, and founded "Intervoice."
The world is crazy. Zika and other pandemics are promising to be a problem for humanity - her fears are based in very real fear. They are just focused on things that other people cannot confirm for her.
And what about the children? Is she now cut off from the children? Does she get support in raising them?
In New Zealand, there is a retreat for Mothers. KarenB knows more (I don't know that it is available anywhere else) - a place where you can go and retreat for a week or two and be pampered and cared for, like a respite care for Moms.
Lastly, there is a group in the Netherlands which is pursuing the line of thought that psychosis, and schizophrenia are non-existent:
Their definitions of the "psychotic" experience are very useful and challenging.
This list would not be complete without Phil Borges excellent TED talk:
Phil Borges TED - Psychosis or Spiritual Awakening?
and this - an excellent view from the inside of what a "Breakdown" really may be (an intense sensitivity and perception of the world that doesn't match outside expectations:
It's not a Breakdown
I hope these give you some places to go. These are things I think about often, even though I feel as helpless as you at times, in the face of "standard treatment" for "non-standard behaviours."
"Easy, easy - just go easy and you'll finish." - Hawaiian Kapuna
Holding is hard work, holding is a blessing. Give your brain time to heal before you try again.
My suggestions are not medical advice, you are in charge of your own medical choices.
A lifetime of being prescribed antidepressants that caused problems (30 years in total). At age 35 flipped to "bipolar," but was not diagnosed for 5 years. Started my journey in Midwest United States. Crossed the Pacific for love and hope; currently living in Australia. CT Seroquel 25 mg some time in 2013. Tapered Reboxetine 4 mg Oct 2013 to Sept 2014 = GONE (3 years on Reboxetine). Tapered Lithium 900 to 475 MG (alternating with the SNRI) Jan 2014 - Nov 2014, tapered Lithium 475 mg Jan 2015 - Feb 2016 = GONE (10 years on Lithium). Many mistakes in dry cutting dosages were made.
Currently Lithium Orotate 1.67 mg only. I will re-evaluate this supplement in 2017.
I have been psych drug FREE since 1 Feb 2016!