Here are some phrases I have used with my three chatterboxes. They may sound harsh out of context, but I'm a single parent with no daycare or outside help, so we are together non-stop. The reason I think it is OK to enforce these words is: 1) It is good for kids to learn self-control and boundaries starting around age two, even earlier for some. 2) I need my sanity.
Here are some favorites. "Please do not ask me anything right now, I need a break." "Please stop talking. I need a break." "Please let me listen to this song (in the car) no talking unil it's over." "Right now I am doing soemthing, and I can't talk." etc etc etc
You get the jist. The key is enforcing. Once you have given the direction, and they understand it, you do have to treat it like any other disciplinable action or they won't care what you say, and they'll keeeeeeeeeep talking. If you use your firmest method, you won't have to do it very many times before she listens when you tell her to step away and self-entertain for a few minutes. You don't have to get mad-and you shouldn't, but you do need to enforce.
My 4 year old (just turned) is old enough to absolutely comprehend this. All my kids were at age 3. If she approaches me and talks non-stop while I'm trying to pay bills or whatever, I'll say, "Sweetie,right now I cant' talk, you need to go play with the legos please." (she knows this means she can do whatever she wants, she doesn't HAVE to play with the legos, but she needs to go do something. If she CONTINUES to talk to me, I stand up, rigth away and say, "OK, Sweetie, I said I could not talk right now. You need to come with me" and the I take her to do a chore that she has to do or else. I'll usually take her up to her room and say, "You need to put all your clothes in drawers and all your toys in the bin and I'll be up to check in a few minutes." She knows she has to do it. She got swats on the bottom for stuff when she was too little for sophisticated consequences. It takes discipline. Now I really never need to do more than just let her know nicely that I am busy and she needs to let me do something.
Now, if you're not really wanting discipline, and you're just looking for ways for her to be happy and busy when you need a little breather, good luck with that. My kids would NEVER peel away from me for one second if I didn't enforce this firmly.