not again

my phone rang at work this morning and i was on the other line.
in listening to my voicemails, it was a coworker. she's not in the office today and sounded a bit quieter, softer. She was recently getting over a cold, so I assumed she might've still had some residual. sick time right?

I called her back: "Hi! *insert name*! How are you doing? "
Coworker: well, my grandmother just passed away so i'm just trying to deal with that.
Stupid Jo: omigod, I'm so sorry *insert name*.

she was calling to follow up on documents my supervisor was requesting from her.
So i did the favor and got off the phone feeling like a putz all over...