Regardless of her rev rate, if she contributes a bunch in her area, and knows the basics, and is a nice and respected person, she can sell a lot of bowling balls.
People want someone who will listen to them, and perhaps give them a pointer or two, and they'll buy your recommendations.
It's up to the sponsoring company who they choose, so why not congratulate her and enjoy the rest of your day?
P.S. Brunswick has treated me like a king for nearly ten years now. Someday they may want someone else in my spot, and if that ever happens, I'll be grateful for some really fun years and move on. This is bowling. It's not life or death, but you wouldn't know it by visiting this site. Sometimes this place can be a great spot to gain/exchange ideas from other bowlers while other times...