I just built up a 1994 Nishiki Bravo A into a comfort style bike for our adult daughter, totally low end but it's a solid unit and with the higher bars she liked it a LOT better than the hybrid fitness bike she tried first. Personally, I'd still take it to a LBS and have them do a tune up on it, jmho and you and the Mrs. will have piece of mind. Nishiki in one form or anohter has been around for a LONG time, I'm sure it will be a fine "1st. bike" for your wife.
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Take Care, Ride Safe, have FUN! :)
Jo: 2009 ICE Trice T
BJ: 2011 ICE Sprint Special Edition