Note softened her up - reaching breaking point (3,2,4,6)
I believe the answer is:
end of ones tether
'breaking point' is the definition.
I know nothing about this answer so I can't judge whether this works.
'note softened her up' is the wordplay.
'up' indicates an anagram (letters get chucked up).
'note'+'softened'+'her'='notesoftenedher'
'notesoftenedher' with letters rearranged gives 'END OF ONES TETHER'.
'reaching' acts as a link.
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