I would not pause the history, i would populate the history with balanced contents and then (if you feel like your mother will actively look for radicalized content) pause it.
So that the algorithm will have something"balanced" to work on.
Re not acting immediately: per GDPR they can't keep deleted data on your activity more than a few months (and probably they do before the deadline)
I guess they may have thought you were there only for the "legal speed".
I would just try another doctor... I would not take it personally... Albeit it sucks you had the experience 😕