I would call my DD more of an abstract artist vs a detailed realist. She's in K now and does fine when she needs detail (like find the second biggest fish and put spots on it) but most of the time it's not entirely in the lines. Now that she's a bit older, she's starting to be more careful. I think your DD will be fine, and it will be more important that she knows what color red is than if the red stays on the firefighter's hat.
The other thing with my DD is that I realized she was drawing everything, including the story in her head. So if the cat blob was playing with the string blob, the string got everywhere and DD drew the action. At one point I was taking intermediary pictures before she obliterated them that way, but it took me a while to understand. Maybe your DD does something like that, too.
I would just praise her when she colors something well and ignore the rest. I do remind DD to slow down and not draw action when it's a birthday or thank you card, though. That's about the only time I care.