I have observed the change in approach to use aggressive (clickbaity) thumbnails, but I do think the quality of the content has not changed.
And I can't blame her for adopting this trend, in many cases it is the difference between surviving or not on YouTube nowadays.
How would she not survive on YouTube? Would they block her posts if she didn't use a misleading title and thumbnail (shout-out to dearrow for those who despise this practice)?