Yeah this is how I’d handle it, simple and to the point. As a bonus I might add “I’ll let you know if I need a hand” which takes the impetus away from her so she knows her ideas are unwanted, but stays professional and polite.
Or the variation, "Ok!" with a smile and simply carry on. I understand the urge to "fix" this person, but it is never worth the time. Smile and nod and then ignore what they said.