Go with consular processing which takes about 12-18 months these days. You are asking for troubles (visa fraud/misrepresentation) if she comes...

Can a “not legal separation” affect our US immigration process?

While you don't have any issue showing the good faith marriage at inception, the Embassy can ask about (and take into consideration) the current...

Can I get my permanent residency in California if I have a misdemeanor possession of a controlled substance on my record?

A conviction for drug possession, simple or for sale, would pretty much end your chance to get green card. You should work with criminal defense...

Any 212h waiver for hardship for spouse and children after sentenced for mail fraud and visa fraud and time completed ?

You will probably need 212i waiver too. Go over the details with a competent immigration attorney.

. Can I apply for a Green card for my daughter 23 years old?

If your daughter came here on K-2 visa with you before her 21st birthday, she should be able to adjust (get green card) now.

Would it be easy to obtain citizenship?

You forgot to describe what status you have in this country - U.S. citizen, Green card holder, Non-immigrant status, undocumented, or others.

Petioner doesnt want to continue the petition.

In a family-sponsored case, the petitioner must sign the affidavit of support. There is no way around it.

Citizenship and DUI ?

That is not good. Unless you (or your criminal defense attorney) could somehow have this charge dismissed (or win a not guilty verdict), you will...

I want to ask about my green card ?

Your green card is technically valid as an entry document up to one year. But every time LPRs (legal permanent residents) spend more than 6 months...

How do I bring a child I adopted to the United States?

Since you have already adopted the child, I doubt the Hague Convention route is still available. See Hague Convention procedure here...