All grief is hard work, but some situations, like cot death, can be especially difficult for anyone to handle. Your friend is showing significant and worrying signs of an excessive, complicated and risky level of grief, however, and really does need and deserve proper expert help.
I'm worried when youj say she "won't see her psychologist any more", as this implies whe had previous problems and was seeing a psychologist, but has now stopped doing so and is reluctant to do so.
There will be a genuine risk of suicide, so do, with the help of her husband and family, work towards gently but firmly urging her to see her psychologist again, or a different psychologist, but someone familiar with the difficulties of grief.
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