Do you guys actually think you are being helpful here? Is it that hard to keep you mouths shut? This is obviously a person under quite a bit of stress. Is your "tough love" really an attempt to help her or just self serving gratification (don't answer that, I doubt you can objectively)? Has the sum total of your posts been beneficial or harmful to her well being? Are your posts so intensely profound they have aroused an epiphany in her way of thinking? Regardless if you were right or wrong, again, is it that difficult for you to see your posts are not helping this person in a precarious state. She is right, she never solicited your advice.
Primum non nocere. Heard of it? Next time just go ask your wife to confirm how clever you are.
Before you respond, do some introspection. Have you helped this person? And before you say yes because you were honest with her and shot straight with her instead of blowing sunshine and rainbows up wherever, were your posts so profound that they just had to be said, or could you have kept your mout shut and saved this person some distress? If you couldn't recognize her distress, and been the bigger person and kept your mouth shut, it's not she who is the failure.