Labs shed. Massively.
The furminator is a decent tool. Giving good bathes with the HV air blowers will take a LOT of hair out too, so an occasional visit to a pro groomer will make lots of difference.
If you bathe at home, brush her when she is wet with shampoo, then rinse, then brush again wet, then dry her, then brush one last time. It's a lot of work, but it will make a huge difference.
Some people shave the labs, and that definitely gets rid of the shedding temporaily. But it is expensive. And it has to be repeated when the hair all grows back, PLUS the hair that sheds in the meantime is cut hair, so it's sharp. But hey, we shave a LOT of labs here, and they do fine, and the owners seem happy with it. Shrug. If *I* owned a lab I wouldn't bother shaving it, but just do the brushing, use a deshed tool, and washing.
Make certain you rinse EVERY bit of soap off the dog when you do wash. Leftover soap residue will make her itch.
I hope this was helpful.