Is there any reason or meaning why a girl would cup her breasts while we are talking?

There is this girl I'm friends with at work, sometimes when we talk, I've noticed she kinda cups her breasts, not sure, but it kind of seems like an unconscious thing.

I've really never observed any other of my female friends do this, thought it was kind of odd.

I haven't really seen her do this while talking to other people but I'm not really around her all day so I'm not sure if its a normal behavior for her or not.

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Instead of cupping, I probably should have said framing.

She put her hands, with her index fingers on the underside and her thumbs on the outside and held that position for a little while as we were talking.
Is there any reason or meaning why a girl would cup her breasts while we are talking?
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