Zeiss stuff runs from run of the mill junk to fine equipment. Part of it depends on whether it was made in West Germany or the eastern sector. I could be wrong, but I think the eastern ones are marked Zeiss Jena. The Zeiss factory just happened to be on the wrong side of the line when they drew the Iron Curtain. But I think they set up manufacturing on the western side, resulting in two Zeisses.
If it's been sitting a long time, the lubricants may have hardened and the camera my operate erratically, if at all. Don't force anything. A good repairman can do a CLA (clean, lube, and adjust). It would be even better if he/she was in business when cameras weren't computers. That's when I gave up working on them myself. A reputable repairman will tell you if it's worth the effort. If he tries to buy it from her, think twice.
Zeiss used to make top-notch lenses used by several manufacturers.
Have her take pictures with it and see how it works. Just don't try to put new pickups in it or look for the initials TG
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