Bear in mind for watch content creators the majority of income is from sponsored content, not views as it's a small market, although CPM is no doubt high. Someone did make a video about that awhile back. Another good example is the credit card reviewers who make a shed load via YouTube despite a small audience. I don't know specifics, but she must have link ups with big brands through their other YouTube channels/endeavours, she managed to be the first of the private YouTubers to get an Odysseus pre-launch and that was her very first video. She also advertises expensive merch via the channel, again no way to know sales numbers.
Anyway long story short, I'd be surprised if she's not bringing in a decent pay check off this, but it is conjecture as I of course don't know her finances. Certainly the days of YouTubers, Twitch streamers, eSports etc being the domain of kids and people with nothing better to do are long gone, it's big business now!