Why does my guinea pig wheek when I enter the room?

Why does my guinea pig wheek when I enter the room? She's only been doing this for the past few days. She doesn't come out, she just sits in her igloo and wheeks at me. I talk to her, and she calms down a little..I don't think she's scared of me. Its weird, when she has her igloo, no matter what, she's going to stay in there. But when I take it out, she loves me..?