Both of my girls go through this, even when they dont see my mom for a few days they'll get anxiety and cry for me. My one daughter if my grandma even looks at her she starts crying. The only thing for me that helps is to calm her down a bit and hold her and eventually she warms up to whomever. Maybe give yourself a few extra minutes to play with her there so that she feels comfortable and then go? The only way they're going to outgrow it I guess is by exposure to new people and places.