Big difference between trying to convert from live to f/t, and from mouse to rat. Live to f/t can be harder. I would try getting her on rats. There is nothing wrong with feeding live, IMO. If your husbandry is spot on, she is likely to eat better too. If she wouldn't eat/switch for him, how was his set up? Tank, tub? Temps? How were temps controlled? A thermostat to control uth is a must.
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