The truth is, Mom would certainly be less worried if Haruko had more confidence towards her situation. Not the ideal outcome, but a great outcome nonetheless
She considered "might this lead to her just giving up even more" - but decided that "I can't say anything because at least she's trying something - and it's healthy".
(Also - once the parents die, daughter will be on the streets if she doesn't get a life, and then she'll be miserable anyway, so there is a deadline to it all.)