It is not normal for a rabbit to lose claws, makesure that you are trimming them, and if you already are, that you aretrimming them often enough. If you need help learning how to trimnails, I know I saw some instructions somewhere on the forum and I'msure that someone would be more than happy to help explain how thatworks.
You may want to take her to the vet, if she has open wounds on her feetwhere the claws are falling out. I imagine they might get infected ifnot kept a close eye on and maybe cleaned.