What is not clear to me is what type of POA we are dealing with. Is this a POA for health care decisions only? If that is the case it would not extend to doing transfers of property. If it is a more complete power of attorney which has language giving the appointed attorney the power to transfer property, it would have to be a durable power of attorney to allow such actions when your mother is in a demented state. If it is not "durable" the power ceases once your mother is no longer competent.
For answers on how to deal with your sibling's actions under either form of power of attorney you need to contact a lawyer in Ohio. Different states have different statutory laws about the implementation and enforcement of powers of attorney. The will is not controlling until your mother dies so it really isn't relevant to any discussion as to property while your mother is alive. (If the property had been put into a living trust, then the terms of the living trust would control while your mother is still alive.)
Keep in mind that if your mother is or will receive benefits for long term nursing care under Medicaid, Medicaid will require her assets to be liquidated and used to pay for her care before she can receive the benefits. Any transfer of her assets prior to receiving the Medicaid benefits could be counted against her eligibility and might work against her receiving the care she needs.
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Your inquiry is confusing, to say the very least. What I do understand is that you think the Attorney-in-Fact appointed under your mother's Power of Attorney is abusing his/her discretion and is not being forthcoming with information about your mother to you (her children). If this is the case, I highly suggest you contact an elder law attorney in your area to discuss your options at this time. If your mother is still has mentally capacity, she may be able to revoke the current Power of Attorney and execute a new one in favor of someone more responsive to the family. Again, my best suggestion is to contact an elder law attorney in your area for practical information regarding your mother's and family's situation.
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