Your friend will need a family law lawyer to get the divorce. My office practice the immigration law and family law, if she lives in the Washington, DC metropolitan area, we can represent her for divorce. If not, she can get some general information from my office on the related issues first. The law in most states are more or less the same regarding divorce.
My office's phone number is (202) 965-4348 and my website is runanzhang.com.
Hope the message helpful.