I don't know why anyone here is surprised, it's the way influencers work. Either something bad has happened (and I sincerely hope not) or she's just playing the influencer game. I do feel for her followers though because you can see in the comments that they're clearly worried.
In their eyes, she's taken them along for the whole journey (the big announcement, the baby shopping vlogs, clothing hauls, bump photo updates, packing the hospital bag) so they're obviously worried that around the time she would be due to give birth, it's radio silence. For someone who was adamant they would be vlogging their birth, it would be odd for them to expect her to want privacy.
It's just the influencer culture, sadly. Her audience are largely made up of young vulnerable people who likely see her as a friend, so she'll monetise that when it suits her and leave them in the dark at the right time to up her engagement.
Like someone said, it would take 2 seconds for her to post a story saying "all is well, we're just taking some time as a family" but doing that would stop people commenting on her posts every day.