The trigger for her problem is the fact that her husband is seriously ill, and may not pull through
As Dozy said, that's enough to depress anyone, to see a spouse who is ill and dying. True, there may be other factors that make it worse, but as long as this situation exists, she's going to be going through a hard time.
Tuesday's and LWT's advice are excellent...she is going through a very stressful time and needs professional help. Anyone who is nursing a terminally ill person needs counseling and support. You're being there as a supportive family member is invaluable as well. She may get some support from the friends at the hall - not all are devoid of human emotion or lack of concern - but they're so hounded to keep their 'spiritual' schedule busy, they won't have a lot of time for her. And as Blondie said, the elders will only tell her to pray and don't miss meetings, so they won't be much use at all. Your unconditional support and love while the congregation slowly pulls away from her at this time may be the catalyst to helping her see that 'true christian love' leaves something to be desired once things settle down.