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And...My friend has a similar instrument and calls it a harpsichord. I believe she may have purchased it at an estate sale. 

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Zither

According to the Dictionary, the zither is a stringed instrument consisting of usually 30-40 strings stretched over a flat-sounding box. It is played horizontally with the fingertips, a plectrum, a bow, or sometimes by wind, as is the case with the Aeolian harp.
Traditionally, it is a folk instrument of Austria and the Bavarian Alps. The melody strings are stopped against frets on the finger board while being plucked with a plectrum.
Alternate names: zitera, cithara, kitthar, cither, zithern., or German version of the cittern.
Some also call the Pennsylvania German zither, the German concert zither, the guitar-zither, and some plucked psalteries zither's as well.

Harpsichord

A harpsichord is a keyboard instrument whose strings are plucked by means of quills or plectrums. It is of German origin and was made popular from the 16th to 18th centuries.

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Zither Info

Harpsichord Info