I think the main elements here are:
1. Mom is a spirit, died at birth, can only be seen by the daughter
2. They are the same age
3. They are opposite characters
4. Mom leads daughter to unfamiliar situations
5. It's a comedy - drama
An additional element would be whether mom have lived the life she wanted or she was shy too and hoped her daughter would live the life she always wanted inside her to live but didn't.
A suggestion would be "Mom"
But with the additional element I mentioned, we might understand who is the hero. The mom or the daughter.