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The woman who is the executrix has a legal duty to collect all of your father's assets (bank accounts included) and to account for them in writing to the court. AS a beneficiary you are entitled to see that accounting. She has to account for every penny she finds as an assets and every penny spent. The Court has time limits on when the accountings must be returned and filed with the court. So you need to see what is in the court file and get copies from the court as you go along.
If this woman is not doing her duty with accurate and proper accountings, you can file a petitioner with the court at any time to remove her and ask the court to appoint someone else as in her place. The court will do that.
Also, if this woman steals or misappropriates the estate assets she is personally liable to the rest of the beneficiaries for what she has done. She should have filed with the court a "bond" in an amount at least as much as the assets of the estate. If the will provided that no bond was needed, you could still ask the court to require one.
Keep a close eye on her.
All the best.