A singer says she has a very loud voice & thinks this will cause problems when she comes to record in my studio.

I have a Nuemann TLM 103, an AKG Solidtube, a Sennheiser 421, a Shure SM57 and a kick drum/Tuba/bass mic

Does anyone reading this think it really could be a problem?

That seems very unlikely.
You can probably:

1) Lower the gain on your pres
2) Engage the pad on your mics
3) Position the singer a longer distance from the mike.

Cheers: Dixiechicken

She's probably overloaded a few cheap preamps in the past, but if yours has decent headroom and you drop the gain way down you shouldn't have any problem.
Actually, the biggest problem I've had with loud vocalists is reflections from nearby surfaces. A singer belting it out can really activate a small room.
Good luck!

just add a little compression...or, if she's a screamer i'd use the 57 and a pop filter and let her get right up in it.

For recording vocalists who scream and roar, are dynamic mics better?

Jim

Perhaps simply more rugged?

screamers don't really need a condensor mic to capture those "special nuances". it just depends on the song really. if it's constant up close screaming than use a dynamic mic(if you want, set up a room mic too?). michael jackson uses 57's on a lot of the early records(not a person i like, but as far as production goes i'm sure he's used it all)...anyway, it's just an easy step to test a few verses out with both and see what you like best. if the songs have a ton of dynamics and the singer only screams every once in a while you might want to condsider a condensor mic and a compressor/limiter.