The left-most Dion picture is a 2019 advertisement for a Las Vegas engagement. One is tempted to think it couldn’t have been too far dissimilar from her then-current look, lest the audiences be somewhat put-off.
The middle picture was from September of 2019. The right-most, from March, 2020. I’d call that a rather fast progression.
But television and movie depictions of the more common manifestations of vampirism generally work it all through within the confines of a night or certainly within a week.
Just theory, mind you.
(post above)