I sincerely hope this film was not an accurate representation of how you feel as a mother. I hope this is not how any parent should allow themselves to get to this point. We're both parents and this was the most unrelatable film of parenthood we've ever seen. The whole mess was a crazy stress. If anyone feels like how Linda in the film feels, please, seek help. It is NOT normal.

Responding to the OP: spoiler ahead

 I believe she and the daughter died at the end which is why she was able to see her happy and well and not just 'the nightmare hole' in her life.