I suggest that you're taking her too literally. When she says look at this, turn your head in her direction and say, that's pretty. You don't have to literally go look at the item. She's wanting your attention and the look at this is just one way of getting it. This works for me.
I would also, at a quiet time, explain to her that although you love looking at her, spending time with her that when you're busy you have to pay more attention to what you're doing. Then follow thru and do not stop what you're doing. Perhaps remind her that you're doing such and such.
Perhaps finding ways to give her more attention at other times might help. Sit down with her when she first starts coloring and talk about the colors and the picture. Then tell her you're going to cook and that you need for her to not interrupt. Then talk with her before she starts asking you to look.
Or have her help you in the kitchen. Give her a small task such as washing the vegetables, putting them in a pot to cook etc. Or have her stand on a stool and talk with her while you're working.
Remember that it will take days of you being consistent to teach her a new way of acting.
Later: the story of the child asking mom to look while she's driving. My grandkids did that but I found that when I never looked they quickly stopped asking me. I would just say, Not now, I'm driving and we did have a talk, while I wasn't driving but while we were parked about safety while driving.