Georgina is a middle-aged woman who volunteers as a tour guide at the local art museum and at the Museum of Asian Culture. She does this because she believes that the arts are an important part of culture and must be preserved and passed on to future generations. What term would Vaillant apply to Georgina?

The term Vaillant would apply  to Georgina is keeper of the meaning.

Explanation:

Keeper of the meaning is a stage in adult development. This stage is about the "conservation and preservation of the collective products of mankind" or, in other words, passing on traditions, artifacts, knowledge, etc. to the next generation. That is the stage Georgina is at. She works at the museum because of her belief in the importance of preserving the culture for the future generations.