It is not unusual for adult to go on fast when changing environment/owner, the solution is not to assist or force feed, this should not be done unless you are starting an hatchling that refuses to eat on is own, or you have an animal in poor condition.
She was 1300 when she arrived (probably on full stomach) therefore she know how to eat so no more assisting or force feeding.
At this size she could fast for a year without issue, what you need to know and understand is that going off feed is OK and the only things that can be done are to examine and fix your husbandry if needed (consider downsizing her enclosure), offer the same type prey that was previously offered by the former owner (different prey type is never a good idea), and most importantly be PATIENT.
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