About divorce - is there a way to get quick divorce?

A one-year separation is generally required for a divorce in Germany, that is correct.
She should discuss with her divorce lawyer if there is a possibility to deviate from this (this might be possible if both sides agree and all legal and financial aspects are mutually agreed upon).
But you can of course stay together with her before marriage - this would even strengthen your case for getting a visa based on the relationship afterwards!

However, please seriously consider this: If you even cannot agree on something as basic as where (which country) to live together, your current feeling of "being in love" is most likely to not last long and lead to a stable relationship. Living together for a while before the final decision to marry would also give you the chance to "test" such aspects before it's too late.

Yes.. thanks for your answer.
im with her from one year and half.. she visited me and we know each other very good..
for marry her we need paper of divorce..
we need marry if i want get visa for go with her..
Marry her and get visa for go with her.. all that need this divorce.
she put paper now at lawyer..i ask if someone know some quick way for divorce. .

If her divorce lawyer doesn't know a quicker way, then there isn't one.
But you could get a visa for Germany (or she one for your country) based on other reasons, e.g. work or study.