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That's likely. A preliminary hearing for a domestic dispute matter typically determines whether there is enough to charge / move forward with the case. Since she is probably the only witness and alleged victim in the case, she would be a material witness, and the police could seek a "bench warrant" for failing to testify.
Note that it probably would not be an arrest warrant for an actual crime, but merely a warrant signed by a judge to arrest her and make her testify.
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What if she goes to the preliminary and tells the truth, instead of all the lies she previously made up to get him arrested.
Then assuming that would negate their case, the case against him would probably be dismissed, although she could then be charged for making a false statement to the police.
(potentially, depending on the facts)