The painter is really lucky since he can still access her old wallet while most people doesn't, they only lucky to remember if they have Bitcoin when Bitcoin still worth for few dollars.
Assuming that my broad assumption is right — the fact that she might've just saved her Blockchain.com login credentials on her browser, well, Chrome — the most used browser ever, syncs saved login credentials to your Google account by default. Everything should be backed up assuming she's using the same Google account.
Moral of the stories is leave your coins on exchanges since it's much easier to retrieve your old account, if you leave your coins on hardware wallet and you forget your seeds, it's done /jk.
What I like is that the girl in the video realized that she could use all of this for additional promotion of her YT channel, and that she gave $50 in BTC to ten of her subscribers, hoping that one day they too will turn it into their small fortune.
I think it's completely possible Bitcoin would be worth so much than the current price and that's why we shouldn't stop to accumulating Bitcoin when it's still cheaper.