Yes, the 'her' refers to the coworker. No, you wouldn't use 'herself' to show it was Karus. In this case logic helps you - these things are not things that you would 'learn' about yourself are they.
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JimmyylHi,
The following 2 sentences are quoted from finance.yahoo.com.
"While working at a weekly newspaper in Wisconsin, Angela Kargus became intimately acquainted with a co-worker's personal life. Kargus learned about HER fertility problems, that her dog urinates all over the carpet and that she does indeed have a regular menstrual cycle."
Th