It's always best to put a grooming band in first before trying to place a bow.
Amazon.com: Latex Free Dog Grooming Bands by... Maybe just put a grooming band in at first loosely. Once she is accustomed to that you may try to put a light weight bow in after a week or so. It's best to distract her once the bow or band is in until she forgets it is in there.
Always make sure that you have not pulled the fur too tight. You should always loosen it a little once it is in. Try to put your band in as quickly as possible at first. Don't worry about neatness, just put it in and tell her how nice she looks and make her forget about it. Do it daily so she knows it is something that is going to be done and she will eventually accept it as a matter of fact.
Never leave a bow in your dog's hair when you are not watching her closely. Any dog could decide to remove the bow when you are not looking and bows are a choking hazard. Remove the grooming bad at night time because leaving them in for more than a day will make a mess and break the fur. They sell special scissors for cutting out a grooming band that make it easier not to cut the fur by accident.