the breaded had us pick her up at 7 and a half weeks old so she’s tiny.
7.5 weeks is considered young these days, but looked at historically it's not really. Breeders often like to space out the pups leaving mum, to make it easier on her. My Amy as 7 weeks old when I brought her home, (Although the breeder knew I was experienced.) My first dog, way back in 1955 was only 5 weeks old! That really is young, although in those far off days it was quite normal.
Crates: Firstly, put yourself in the place of the pup. All her life since birth she has had her mother and litter mates with her. Her surrounding have been the same ever since she opened her eyes. Human company has always been her breeder and family. Even the smells have always been the same!
Then you came along and suddenly all that was gone! All sights and smells are different, different people behaving in different ways. Then at night, instead of snuggling up to litter mates she is on her own in an unnaturally quiet house. No warmth from other pups, no breathing or quiet snoring noises, nothing! So is it surprising she gets worried?
Your aim now should be to make the crate a happy place to be. I always feed my pups in the crate, just quietly pushing the door shut while they are eating. Not latched on, so they can push the door open and come out whenever they like. I also give treats to the pups while they are in the crate. I'm aiming to build up confidence in being in the crate.
Even from day one I want to get my pups use to being left, so I slip puppy into her crate, close and latch the door, go straight out of the front door, round the outside of the house and back in the back door, letting pup out again. The whole exercise takes about 30 seconds to a minute, but pup gets use to me leaving and coming back. Make the leaving and return as low key as possible. It should literally be a non event. When puppy is happy and relaxed with that I'll start leaving her while I go on "Poo patrol" clearing the lawn. There is a shop close to where I live so after a few days I'll leave pup while I walk to the shop. All the time I'm gradually increasing the time I leave the pup, but in such small increments that she takes it as normal and that I'll very soon be home.
But getting back to nights. There are a few thinks you can do. A well wrapped luke warm, well wrapped stone hot water bottle can help. Snuggling up to this will feel a bit like a litter mate. I wrap the hot water bottle in an old (unwashed) sweater, so it has my scent on it. (Don't use a rubber hot water bottle because a puppy tooth would be quite capable of piercing it.) I also like to cover the crate, using something like an old towel, so when it starts to get light this keeps the crate that little bit darker. I leave a radio going in the room. I find talking better than music, so in the UK the BBC world service is ideal. Just have in on very quiet, so it's just a background noise, helping the pup feel that it's not alone.
One last word. NEVER EVER use the crate as punishment. It should always be a happy place to be!