There is now way to be sure whether your ex would get probation or incarceration. There are many factors provided by guidelines and that courts have discretion to consider. You can, of course, hire counsel to represent your interests to try to get the DA to agree with your position here as to what your ex ought to receive.
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It will be determine by the judge after the trial. This question should be addressed to her attorney.
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I can offer that the criminal threats as a felony is a strike and carries a 3 year maximum. The actual sentence depends on many factors. If you are a witness you probably want to talk to the prosecutor about this.