I watched yesterday a documentary about Princess Alice , containing asking some rare vidéos , especially of Era around Philip's marriage and then.
It shows her arriving at the airport in London for her son's wedding, and then, and somme short when Philip is talking to her, or some staff members.
Philip talks to her and she seems lip reading and understand normally and this match the information we know. He would not talk to her normally If he knew she did not understand.
As for the period of her youth, around 1890, when she was found deaf, was the sign language already developed? Out of some specialist, was it known among normal people, even if royals?
And a last point. She was able to read lips in 4 language, but which language did she speak? For a person who never heard, like she was, how did she learn to talk?
Someone had to spent time to teach her.. I can presume her mother did it for German and English, but what about French and Greek? This happened after her 20s and out of her home. Was it her husband? Did she hire a specialist? For Greek it is possible, but French? She was broken and in exile.