Hi and welcome
Guinea pigs are prey animals; they need more time to settle into their new surroundings. They then need to establish/re-establish a working hierarchical group in their new territory.
Please place a sheet over the top to give the timid piggy a feeling of safety and place hay and water nearby (the two most important things), as well as sprinkling some veg and pellets around. Your piggies will move around and eat when the room is quiet.
Your timid one is currently simply a bit freaked out but will settle down if you just leave her be.
You can find lots more practical tips for settling in and making friends with your piggies - from learning how prey animal instincts work, how you avoid triggering them, making friends with them with a little course of piggy whispering, how to pick them up safely hands-off and prevent them from freak-jumping during lap time etc.
Plus lots of other practical how-to tips, learning what is normal or not, understanding behaviours and some important basic care tips and information in our special New Owners collection that will hopefully help you to a good start. You may want to bookmark the link, browse, read and re-read at need:
Getting Started - Essential Information for New Owners
You are of course always welcome to ask any questions in our Care sections. And you'll get the hang of how our forum works.