Consider they are doing you a favor and leaving voluntary and thus saving you from firing them later. There could be other reasons than what she told you that are the real reason. Some want to shift fault or blame off themselves and put it on someone else.
Start filling this new opening now. If she has a change of heart and later wants to stay you can tell her you already have filled her spot with someone else if you don't want to continue dealing with her anymore. She has told you she's leaving so you have every right to start looking for a replacement.

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