I would offer chop, but also be making sure she's eating. Ekkies often take a little longer to fully wean, so consider offering baby bird formula until she flat out refuses it every time. Kinda disappointing that the breeder sold her before she was fully weaned. You might also give this a read:
Today I spent several hours trying to help someone save a baby bird they had purchased unweaned. The baby died; they are usually almost dead by the time the new owner realizes something is wrong, not because the owner doesn't care but because they are not educated about what to look for or...
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