Consistency & positive reward.
1. Have small treats (Whisker Lickin's cat treats are perfect!) & when the dog comes to you for any reason - reward with a treat. Once she starts seeking you out, reward occasionally - once every other visit, every 3 visits, etc.
2. Separately, put a very light-weight leash on the pooch (can do this in the house, in your living room or whatever), & call her to you. (have a treat at the ready). If she doesn't come willingly, pick up the slack on the leash to put a little tension (don't pull the dog towards you, but don't let her pull away from you, just "hold your ground") & call her again. ANY release in the tension is to be rewarded. A slight movement forward, a paw-step forward, coming all the way - ANYTHING. Repeat.
You may need to do step 1 for a few days/week before starting step 2, depending on how hesitant she is around you. If she isn't comfortable being loose around you at all, & tends to hide, you can do step 1 with her on a light leash, just don't put any tension - reward any behavior she gives you without prompting. Make sure to use verbal praise too.
Added: Don't try calling her to come without the leash, until she is VERY consistent. You don't want to be in a position where you give a command & she can ignore you, with no way to reinforce the command. But at the beginning, it is less of a command & more of an invitation, until she becomes comfortable with the concept & interaction.
Feel free to message me with any additional questions. T. :)