The prosecutors will send someone to try and serve her with a subpoena and force her to testify whether she wants to or not. Then depending on what she says, they will use the police to testify to what she originally said...
Depending on the severity of the offense, she could be arrested and held for trial. This, of course, does not always happen. Typically, every jurisdiction has a sort of unwritten rule as to what happens when an alleged victim doesn't show. Realize also that a subpoena is a court order, disobeying a court order can Have serious ramifications.
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She will probably be served with a subpoena to testify in court. If she fails to show, disobeying a court order can get her in trouble. It is not her decision not to press charges.
Your posting says you are asking from Toledo, so I will answer based on my experience in the Toledo Municipal Court. The City of Toledo Prosecutors have been less likely in the past year or so to dismiss Domestic Violence charges just because the victim doesn't show up. The Toledo Police Department is trying to make better reports and gather enough evidence in every case so they can assist the Prosecutor and proceed with the case even if the victim doesn't show up. However, if there are evidentiary concerns and the Prosecutor doesn't have a strong case without the victim, the Court may grant a continuance or two for the prosecutor to try to persuade the victim to show up, but it would probably be dismissed if there are enough times the victim doesn't appear for hearing.
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