That's a fair price for an S350. Most people are selling them at about 20k+, however there is one in VA going for 13k from a private seller. If you show up there and they do not have the service records...then I would be very suspicious of the car. Honestly you can do the usual and take it to a shop for a pre purchase inspection....if she was well taken care of you're good to go.

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1998 Ford Escort ZX2 5 speed - 279,000 miles My Daily

1992 Mercedes 300D 2.5 202,000 - Pure junk
2000 Mercedes E320 Black - 136,000 miles - Needs repair

Don't forget to grease the screw and threads on the spring compressor.