I don't have a problem with "looky" horses as long as they're not so "looky" that they stop paying attention to where they are going or what I am asking them to do.
If she gets so "looky" that she stumbles and trips because she isn't watching what she does with her feet, then you need to work on getting her focus back to you. This is especially true if you are in the middle or back of a group.
Some horses get "looky" when they get bored. . .and then they use it as an excuse to find something to spook at. I know one horse like that - when he gets bored, he starts looking around. If you don't get his attention back to you, he will do an in-place spook at absolutely NOTHING.
My Little Black Horse is very observant about his surroundings, and it's one of the things I love about him. But when the footing gets sketchy, he focuses on where he's going and "thinks" about his next move before he makes it.
"Parelli horsemanship is just like painting by the numbers. You need absolutely no skill. You just put this color here and this color there, and when you're done, you have ... a mess no one wants." mp