I'm not sure why she was reduced to tears because an ancestor 4x removed owned slaves in a period when slave ownership was commonplace and widely accepted.
To me it's just pointless gesturing from the bandwagon we find ourselves on today.
If it were me I'd just take it on the chin and discuss my thoughts on slavery in the modern world, certainly wouldn't be blubbering on the telly.
I suppose to some extent we are all slaves, salves to work, slaves to the government... People pretend we have freedom but do we really?