To my knowledge, there is no hard & fast policy in Alpha Delta Pi. But, we were always taught (by our mamas, then by our chapter) that you call an alumna "Mrs. Jones" or "Miss Jones" or "Ms. Jones" unless she tells you otherwise - which, 99.9 chances out of 100%, she will. We truly are casual to that extent.
HOWEVER!
You're talking about Miss Blake!! She just turn
100 years old, and was Grand President from (let me look this up!) 1948 to 1977!! You are talking about someone who was Grand President longer than some GLOs were even around! Miss Blake devoted her life to Alpha Delta Pi and to the promotion of the Greek System - if anyone alive today has earned her respect, it's Miss Blake!!
I'm sure that there are those who call her Maxine, but I would be worried about the thunderbolt that would most certainly appear afterwards!!
