If it was me doing the managing for my mom, I'd dial it back to 20/80. And I did.
The consideration I'd put into the mix is, what happens if mom's portfolio fails ? If her required spending overdraws her account, are you "on the hook" to make up the difference ? That was the understood situation with my siblings for my mom. She should have her portfolio managed prudently, get her necessary level of care, and if it failed we would backstop it. Thinking of it that way may or may not change your attitude. It did for me. My mom's portfolio became an extension of mine, because her liabilities also became mine in the worst case.
My mom passed 6 weeks ago. She had less than a year's expenses remaining in her account at the time.