Who would really leave the luxury of the Enterprise to work on a tug boat like Voyager? Wasn't it bad enough they kept bringing back a nobody character like Boothby in uncreative ways?
Q, Riker, Boothby, Barclay, LaForge & Troi, wasn't there enough TNG cast on Voy. without adding Guinan?
Purhaps a personal quest to find more of her people?
Granted not exspecting to be sucked into the Delta quadrant.