Don't take my word for it. Here is the actual law:
18 U.S. Code § 922(g)(4)It shall be unlawful for any person— who has been adjudicated as a mental defective or who has been committed to a mental institution; to ship or transport in interstate or foreign commerce, or possess in or affecting commerce, any firearm or ammunition; or to receive any firearm or ammunition which has been shipped or transported in interstate or foreign commerce.
Asking for someone else to handle your finances is not being adjudicated as a mental defective, and is not being committed to a mental institution.
Well done, you beat me to citing the regulation.