Why does this woman look away/turn her back to me when with her friend but smile and make eye contact when she’s alone?

Ok, so there’s this woman at work who I like. There’s been a lot of signs to suggest she is interested (smiling, blushing etc). I’ve noticed that when she’s with her colleague (they’re a team of two) she doesn’t make eye contact (if she does, her eyes quickly dart away) or acts as if I’m not there. Her colleague often looks at her and then at me when they walk past… so maybe she knows something?
Why would she ignore me when with her colleague?

Why does this woman look away/turn her back to me when with her friend but smile and make eye contact when she’s alone?
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