Some minor condensation may occur in the winter especially if she is mostly driving short trips less than 10mi. Does she do mostly in town driving? It's a good idea to take the car on a longer drive once a week or so to evaporate some of the moisture.

For reassurance, keep an eye on the oil on the dipstick. A coolant leak would turn the oil from clear to hazy/milky. If you really want to be certain you can get an oil analysis done for 20 bucks: http://www.blackstone-labs.com/free_test_kit.html

mormit
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85 245DL 247,000mi V15cam 'Old and Rusted', 02 S40 'New Hotness' --Blake Ashby, Republican for president