The Victim Dropped the charges.?

In my case I am charged with robbery with a deadly weapon and possession of a firearm as a delinquent they evidence they have is a gun which is in my girlfriend's name and registered a purse with no identification and 2 made-up statements saying they did the crime because the detectives made them say it and its been 3 months now and the victim has written two letters the first one stating she wants the charges dropped and that she wants no jail time for the defendants. Then at court they said just no one will get any jail time then the Friday of that week she sent another letter stating that she wanted nothing to do with this case and she wants the charges dropped and these people out of jail to their family's and they don't need to have felony's on their record at such a young age and if she must go to court she will plead the fifth and they are wasting their time and money into this case. I understand the State could pick up the charges but there is like no evidence and C.O.'s have told him that he will get out and charges will get dropped but it could take a year and I wanna know if I can do anything to speed up the process. Also if he takes this to trial will he win? Also someone told him he wont get out till they do Jury selection. He gets told ALOT! of stuff and i don't know what to believe so that's why I am using this Please! be helpful. He is innocent the victim knows it and she is a drug dealer but she is old and she was in the bathroom and saw nothing so how can she be a victim or a witness if she saw nothing and how does she know it was him she told me who it really is but won't fess up what do I do? He can't have a felony on his record defiantly for something he Did Not Do! HELP!!!