What crushed her is “the long craving for his love”

“sve je dublji jaz” – “Sve” in this line is not “everything” but it means that the gap is getting bigger and bigger. Perhaps there’s also a better word for it than “gap”..

“mora se naprijed, dalje poč” – someone made the typical mistake and mixed č and ć, which is probably why you thought it means “početak”. However, it should be “mora se naprijed, dalje poć(i)” (she has to move on)

“u tom moru sivih lica uzalud tvoje tražim ja” – it’s not his sea but “in the sea of gray faces, in vain I search for yours”