Student or Learner
'I told you, darling,' Ragna said calmly, 'I'm going to Oslo for a few days.' [...]
Krisi [he is almost two and was meant to have slept for another hour at least] clung to her and began to whine. [...] She loved him to pieces, of course, but he was just at the stage when he threw mighty rages, and from that point of view this short break wasn't coming a moment too soon.
(Clare Francis; Wolf Winter)
Would you be so kind to explain to me what the part in bold is supposed to mean?
She needed the break, If it had come later, it might have been too late.
If something doesn't come too soon, you are relieved that it has arrived when it has, and not later.