Hi Anne,
I tried what you suggested on the responsive_mobile.css file to have my search field to appear.
I looks like the field appears but will not allow typing into field. Did I miss something? the demo site is located at www.gelcandlecompany.com/demo

Code:
#header-cart{float:right;width:50%;}
#navMainSearch{float:left;width:53%;border:1px solid #000;display:none;}
#top-middle{padding-bottom:0;border-bottom:none;}
#mobile-nav{background:#f4f4f4;padding:10px 10px;border-bottom:1px solid #dbdbce;}

Code:
#navMainSearch{top:10px;}
.search-header-box{width:80%;}
.menu-shop{margin-left:0;}
thank you Anne!