Have you tried playing crate games with your pup? You can look up "crate games" on this forum. These are just fun exercises that help teach your pup that the crate is a good place.
Make sure really awesome things happen in the crate. So, you might feed her in there for every meal. Give her really awesome treats in there, like frozen stuffed KONGs.
And yes, you will have to let her cry it out a bit. It's mostly her complaining because she's separated from you, but she has to learn. I would start with leaving her longer and longer periods of time until you've worked up to a full day. If you can't get back for lunch when you start school again, you may have to consider attaching a pen to her crate with puppy pads because even at 14 weeks she probably won't be able to hold it a full work day.
Make sure really awesome things happen in the crate. So, you might feed her in there for every meal. Give her really awesome treats in there, like frozen stuffed KONGs.
And yes, you will have to let her cry it out a bit. It's mostly her complaining because she's separated from you, but she has to learn. I would start with leaving her longer and longer periods of time until you've worked up to a full day. If you can't get back for lunch when you start school again, you may have to consider attaching a pen to her crate with puppy pads because even at 14 weeks she probably won't be able to hold it a full work day.