My daughter was like that too. Couldn't colour within the lines in her colouring book. I got her a lightbox (Winnie the pooh) from Toys r us and using the lightbox, she would follow outlines. That got her fingers to be more accurate and precise.
Now, she is excellent at colouring and drawing and is forever drawing. She's 5 now, and wiht her 7yr old sister, they are forever doing crafting. I got them lots of small shape cutters so they are always cutting paper bits and sticking them.
Now that they are precise in colouring, I have bought lots of plastic moulds and 3 kgs of plaster cast so during the hols, they and their friends paint the figurines that I make for them.
When they were small, I help them with their motor skills by getting lots of craft things for them to do. Mainly from Bakerross. I got them things like sewing hand puppets. glass painting, lots of stenciling books, threading play buttons/ cotton reels, doing clay modeling together etc.
Getting loads of puzzle books help too like join the dots, mazes etc so they help with their precision.
Sorry this is so long. Both my girls were like that but not they are excellent in colouring and crafting. It also helps their concentration etc.