Loved reading this thread with your experiences and ideas, everyone. Thanks!
The way I see my inner child is that she's the part of me that I kind of "left" when I experienced the trauma. So, for me, inner child work is about reconnecting with her and integrating her with the adult me now.
Something I've found particularly helpful is to picture that younger version of me in my mind and imagine meeting her for the first time. If I were to do that, I'd want to find commonalities to build trust...
So I ask her, what are some of your favorite things? With whatever she says, if I like the same things I let her know.
Adult Me: Hi sweetie. It's nice to meet you. I like the flower on your t-shirt.
Inner Child: Thank you. Green is one of my favorite colors.
Adult Me: Oh, I like green very much, too. Especially seeing all the different colors of green leaves in the trees. What else do you like?
Inner Child: I like to color and ride my bike.
Adult Me: Oh that's fun. I love coloring, too! And I like to ride my bike around the neighborhood.
Inner Child: I also like kittens. They're so cute and fuzzy.
Adult Me: Me too! My cat is such a love bug.
Inner Child: You have a cat? Can I see it?
Adult Me: Sure! (Then I go over and play with the cat for a little while.)
The whole point is to help establish a relationship between me and my little inner child by letting her see that we have things in common and I'm a "safe person" for her to be with.
Not sure if this will work for anyone else, but it's been really nice for me.
I also ask my inner child if there's anything she needs or wants...and then in my imagination I give her whatever it would take for her to feel happier, safer, more comfortable, etc. Sometimes she might want some special food, or a blanket, or some toys, I just listen and mentally give her what she wants. I usually do this while I'm lying down in bed with my eyes closed, or I do it in a dialogue format like above.
I try to do a lot of this work when I'm not in a full blown PTSD flare up so that then I can be more resourceful when those more challenging moments come up. I can also be more practiced in taking care of my little girl so I can be there for her when it really counts.