You might be surprised how well she would accept you talking about what it takes to get into the pickup. The elderly that I know prefer being forthright in conversation. But you know the lady, not I.

 But I like your idea. It seems that usually a lady is used to backing up the seat and setting down into it in a car. So your platform would be nice.

 My hat is off to you for wanting to do this very unselfish thng.