What is a girl's most emotionally important moment in life?

Specifically in the realm of relationships, whether with a girl or boy depending on preference, what is the most important moment in a girl’s life? No matter how old she is, what point in time has the absolute most impact on her psyche, that she has built up towards? That almost every girl would dream of, or for?
I googled it, and the images section would imply marriage. The romance idea would support the first kiss, or maybe every single kiss she has with a man she truly loves. I am curious if a girl would answer one or the other more strenuously, or if there is one I am not even thinking of.
(I had to edit the question, so a couple answers may seem off topic a little)