No, allocate 100% to yourself. There is no way to split the 1095-A policy by months. The household total annual income is used in calculating Form 8962 for the Premium Tax Credit.
For a college student, the amount of their income doesn't matter. What matters is if you provided over 50% of their support. You could probably claim her as a dependent (and her education expenses) on your return.
If she files as a dependent, and she earned 10K, her Standard Deduction would be $10,450. She would owe no tax and could get any tax she paid on her wages refunded.
Here's more info on What does Financially Support Mean? and Did I Support Myself?
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