Can a prosecutor use DNA for conviction when the is consensual? the defendant is not willing to testify?

The plaintiff is not willing to testify but the prosecutor is so much engrossed and has a personal interest in the case. The plaintiff is was 22 yrs old at the time of the incident. defendant paid for her gym membership has prove of evidence. The defendant was also asked by by victim to pay her car insurance but when defendant refused victim claim . Prosecutor keep postponing the case how long can the case be postpone to protect my constitutional rights or hicks rule.