Hi there, I'm Dr. Sara - thanks for sending in your question today :)
You have definitely hit upon one of the most common questions that I get asked on a daily basis. There are a few things we can do to try to remove the dead fur from our kitties, but in general the amount of shedding that they do is individual and can be VERY impressive! You are absolutely right when you say it "looks like it never stops"!
My dad was a vet for 50+ years - I grew up hearing him tell clients "If she's not bald, it's not abnormal!" As long as they aren't developing any rashes, scabs, or bald spots, it's within what we'd consider normal for a cat.
So what things can you try? Well, you've already started with one and that's grooming. The flea comb is fantastic for pulling out old fur. Another product that I like is called a Furminator. This product helps remove old coat and shorten the remaining coat. If she has very long hair, a wide toothed rake type of comb can be helpful.
I have many clients (especially with long haired cats) visit the groomer to have their cats either just bathed or fully clipped down. The special types of spray nozzles the groomer uses can remove large amounts of old fur and give you a bit of a "shedding honeymoon" after grooming where she won't shed nearly as much. For longer haired cats, fully flipping their bodies down can be a very attractive option. I have a lot of clients tell me that they think their long haired cat is so much happier after being clipped down. Sometimes it's only necessary to do this once or twice a year.
I hope that you find this information helpful. Please let me know if I can answer any other specific questions for you!