Does your fiancee like bubblegum? If so, the lager should be a hit.
I am still a little confused. Regardless of switching the yeast you still would have been fermenting both at ale temps.
It is not the switch that would cause off flavors it is the high temp on the lager yeast. That said, 55o is not really too terrible. Can you get the lager cold for a couple months? You should. That should clean it up fine.
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