All great advise!! I just wanted to add to what Flicka said. I would definately recommend you change the word to 'here' or something else that way you can start all over with training her to come to you. And just as Flicka said, never say it if you don't think she will succeed! You can say her name when you call her. For example with my puppy right now I say his name "Wit" and say it strongly. "ZeNA" you can put a stonger (not mean) tone on the "NA" of her name to make her look at you. Most times this will get the dog moving towards you when they hear their name but if not you can use a toy or run the opposite direction of her, or just take a few steps backwards to make her come towards you, once she is coming towards you say "here". If she stops half way run the other way and clap, hackle, woo hoo, Zena catch me... ect. Make it a game of chasing YOU! I will even tell my puppy "come and get me!" If she likes a tug toy, use it only to reward her coming to you, that way that toy is so exciting when you pull it out to play with her.
I don't like to say come or here too 'loose' and playful b/c they will not respect the word if you are saying 'here Zena, here in a high pitched playful way. Remember that a strong recall CAN save your dogs life so it is definately something you want to work on in your back yard constantly. If you say 'come' in a tone that displays play... my dogs say 'oh she doesn't mean it' and keep on doing what they want. If I say COME and mean it, they know the difference. I love the excersise Flicka mentioned about 'loading the word'. That will really make a difference and she will succeed a lot easier by doing this.
Also, for the first few weeks I would leave her on a long line 30 or more feet when you are practiciing, this way you can give a tug on the long line when she isn't paying attention to you or is ignoring you & if that doesn't work you can reel her right into you.
If you are using treats , when she comes to you, put the treat between your legs at her eye level so she has to come ALL the way into you, I usually make them sit automatically but you don't have too. Reach down and put your fingers through her collar and pet her, praise her. Putting your fingers through her collar will desensitize her to it and if there is an emergancy she won't back away when you reach for her collar.
I hope this makes sense and helps give you some ideas. Good luck! Let me know if you need me to clarify anything.
Happy training

Sarha