>>I've recently adopted a 9 week old daschund puppy. Now, she's been quite good at potty training, great with other people and dogs and she doesn't bark a lot. The big problem is the crying. I've been crate training her and while she will go in there on her own, the moment the door closes the crying starts. I've tried moving the crate into my bedroom or leaving it in a place where we can't hear her but the crying has worsened, if anything. Now that I've moved back into an apartment this has become a BIG problem, because I can't just ignore her until she stops as I'm afraid that the crying will disturb the neighbours. It's gotten to a point where I can't even leave her sight for a minute without the wailing starting. Today being separated by the shower curtain was enough to get her going.
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>>I've tried giving her a stern "no" and a squirt from a water bottle whenever she gets really bad but it doesn't seem to phase her. I've tried leaving the room for short periods of time and then coming back to show her I'm not leaving her. She has also began crying whenever she wants attention and at nine weeks, that's all the time. 
I'm not really sure what else to do at this point. If anyone else has some suggestions on what has worked for them I'd be eternally grateful.
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I hate that water bottle correction. It's very popular, but it risks making your dog afraid of spray bottles. Life is full of spray bottles!
The puppy has an instinct to call out when left alone, because a puppy alone in the wild would be killed. So you're dealing with an instinct, and trying to stop an instinct cold is not only not effective, but tends to create worse behavior problems than the one you start with.
This is often a noisy breed and not the best choice for a home where no noise can be tolerated (protective barking doesn't come in puppyhood; it comes much later). You might try putting her in an easy-to-handle crate and putting that crate right up on the bed. When you're not home, you may need her to be with a puppy-sitting arrangement of some kind. She's too young for doggy day care. Maybe you can pay someone to keep her at their home.
This is not an easy problem. Dogs are who they are, and some of them are incapable of being quiet enough for such living situations. Punishment won't work, and it's not fair, either. It wasn't her choice to be in the situation in the first place. But--punishment doesn't work for this problem. It makes it worse. The more stuff you "try" for this problem, the more anxious you make the dog, and that makes this worse as well as creating worse problems.
A veterinary behavior specialist in person is your best bet. Be very careful about this punishment approach. People wind up escalating into using shock collars on their dogs, and turn the dog into an aggressive nervous wreck. That's surely not the kind of dog you want, and no life for her, either.
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Kathy Diamond Davis, author, "Therapy Dogs: Training Your Dog to Reach Others," 2nd edition, and the free Canine Behavior Series articles at http://www.veterinarypartner.com/Content.plx?P=SRC&S=1&SourceID=47
Pup probably misses somewhat the litter mates. By reacting you are reinforcing bad behavior.
