Popular feels like the wrong word. If you’re the only game in town for a specific service, that doesn’t inherently mean you’re popular.
If you have no other competition in a specific service whatsoever, no matter how many people despise you, you’d still be the most popular by lack of competition.
Depends on how exactly you define popular.
If you use a definition that includes anything like “liked and admired” then she doesn’t fit. Her service is busy but as this thread shows, most people openly state they only go to her because they have no other choice for these cracks.
Using popular hides how many people actively want to jump ship if only there was competition. It’s like saying that Comcast is popular because they have so many customers who don’t have a viable alternative to using them.