$600 isn't just a bit excessive, more like a complete rip off. They must have done some other work for that money, probably the 60k service.
I think my local dealership charges $80 just to change the oil.

Make sure she goes over the paperwork with the breakdown of everything and check she hasn't been had.

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1993 320TE M104
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past:

1983 230E W123 M102
1994 E300D S124 OM606 (x2)
1967 250SE W108 M129
1972 280se 3.5 W108 M116
1980 280SE W116 M110
1980 350SE W116 M116
1992 300E W124 M103
1994 E280 W124 M104
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"music and women I cannot but give way to, whatever my business" -Pepys