As for the 1099-INT, it belongs to you and you should report the interest income on your tax return. It's not important that the estate EIN or your mother's social security number (SSA) is on it or if your SSN is not on it.
An estate is an estate - current or finalized. The bank has no grounds to hold the money and you have the proof the income and account belong to you. I would pursue this. Once this is resolved, of course you need to move the money to another account. It's up to you whether you want to pursue it, but you have all the proof you need to show you are the executor.
@JHW23
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