There are no federal regulations that address the handling of IRA's in a conservatorship. The answer to your question is entirely a matter of the law of your state and, specifically, the statute that spells out the powers of a conservator. Your bank's attorney should know...
It's not your responsibility, but I would want to point out to the conservator that a withdrawal from an IRA has income tax consequences for the ward, it's not the same as just taking money out of a checking account. Having dealt with amateur fiduciaries, it is unrealistic to assume they know anything.
In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.