Thanks for your response.  It is always good to get other ideas on these issues.  However, I don't agree with the answer to line 19a being "No."  Yes, that solves the problem but that is not the correct answer.  19a asks "Was the property not used as the taxpayer's principal residence for any period after 2008?"  It was not used as her principal residence for the period 7/1/17 to 6/30/20 so the answer to line 19a has to be "Yes."