Just looked up Sierra’s channel.
She has 1.17M subscribers.
Draws in views with numbers similar to TTT.
Though her posting are erratic. It could be a week, two weeks, a month or more between videos.
Since I never heard of her, till you pointed her out, I can’t speak to your thoughts on her.
What I will say is that Ginn would definitely benefit from watching some of her videos.
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And in specific topics, like the Disneybounding styling outfits video, Sierra appears to include and credit other people that have more expertise than her.
Update: I am viewing the Disneybounding video.
IMO her video has a storyline, is well shot/edited, informative and entertaining.
She is a bigger girl, like Ginn, but dresses in size appropriate clothing.
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If interested: