Based on the statement the tour put out, I can't really see it being anything else tbh.To be fair we don’t know that that’s the reason she dropped out of tour though. For all we know there might genuinely be personal reasons and just unfortunately timed.
They're not gonna be like "We're disappointed by her decision, but wishing her success for the future" if she was stepping down because of something like that, they would've just said she's not taking part due to personal reasons, injury or whatever.