I have to mention this since it is in the thread already. Please do not try to use dominance on a puppy. If this is more than play biting then she is likely insecure and aversives are extremely risky when you do not fully understand the problem. It could make a small issue into a dangerous problem. And it could destroy the trust she has in you as owners.
It is completely normal to be playbiting, puppy teeth are sharp and some puppies have not learned to control their strength yet so during rough play they can draw blood. It is also normal for them to get a little crazy around bedtime, it is like children when they get hyper and fussy because they are too tired. Resource guarding however is not normal. It's common, but must be handled correctly.
First find out why she attacks. Is she playing? Is she insecure about being picked up? Is she insecure about being stuck in the crate? Is she resource guarding the crate or something in it? If you cannot figure this out then you should seek help from a behaviourist. Someone who can tell you what's normal or not and who can show you how to deal with it safely. You can also try and describe in more detail what happens before and during these episodes and how you react to it. It would be easier to give advise then
If she doesn't like being approached in the crate then have her come to you rather than reaching for her there. If she is insecure about being picked up, then ease her into it by being calm, sitting down with her and using rewards. If she is resource guarding then there is a ton of things you can do to solve that, whatever you do don't fight her. There is a book called "Mine!" By Jean Donaldson. It explains resource guarding and how to avoid it/fix it. It's a small book and it's brilliant for any dog owner to have read.
Another small book I think every puppy owner should read is "On talking terms with dogs: Calming signals" by Turid Rugaas. It helps you interpret a dogs behaviour and understand what signals they are giving. Is it aggression or playfullness, fear or anger etc.
People on here are very knowledgeable and can help you with advise whatever the problem (if any) is. But the first step is figuring out what it is. Puppy classes are a must, and if you are worried about this behaviour then get help from a professional trainer/behaviourist. Because if you are insecure, she will be insecure so getting the opinion of someone like that will make life easier
You ask about cocker syndrome and I do not think it sounds like it at all. It sounds like he is either a normal puppy with zoomies and not yet developed bite inhibition. Or it sounds like she is insecure around the crate or has some resource guarding. All things that can be trained by using positive training methods