Hi there, and my apologies for the late response.
Dreaming of one's own past/childhood is actually a pretty literal translation, you are longing for a time when life was simple and had few responsiblities, particularly if you have a decent childhood to return to. This is also a common dream for mothers of young children.
Churches are also pretty literal as well - its a way of trying to find guidance in your life, whether you're a part of an organized religeon or not. The fact that your mother was there is probably that part of guidance that you may feel you're missing out on since she passed.
Red is by far the strongest of the spectral colors and has the most meanings: love, passion, anger, sensuality, stength, energy - the life force of colours.
I think you already know the answer to these dreams
If your mom could've hit you over the head with a frying pan to get through to you and say what she needed to say, she would've, but it looks like a red dress, in church, saying goodbye and leaving you with someone she cares about and trusts just might have done it.
