Not sure what you mean on the "a LOT has changed in 5 months". I'm pretty sure Taylor Swift has been pretty popular for a while.
You're not saying Travis Kelce is the reason she's so famous now are you? That's really all that's different recently for her.
The Kelce thing has absolutely brought her 'fame' (amount of people who know of her, talk about her) to millions and millions of middle-aged men.
As her tour stats grow (on pace to be the highest grossing tour in the history of the world), her popularity grows.
Her fame is still growing, so of course she has become a LOT more famous in the past half of a year. She is the fastest GROWING star in terms of instagram followers on earth (gaining almost 40 000 followers PER DAY).
So yes, a lot has changed in terms of number of people who know her/follow her in the last 5 months.