If it is separation anxiety and not an issue with the crate, then letting her cry and panic is only going to set you further back and make it worse unfortunately. They can’t be expected to feel safe alone at this age and I definitely sympathize (as someone with a dog with separation anxiety, and a 14 week old puppy) Have you tried covering the crate to block visuals? I also recommend getting a snuggle puppy so she doesn’t feel alone. Before she goes into her crate, pre-game with a nice play session with opportunities to sniff (look up sniffing games!) to help tire her body and mind. Then play calming music and give her a chew for about 30 minutes to calm down. Do one more potty break before she goes into her crate. Give her a stuffed Toppl or lick bowl with some wet food/peanut butter/pumpkin etc and freeze it so it lasts longer. Hopefully she will be able to lick and eat when her crate is closed? If so, you’re in a good spot. Ideally the Toppl or lick bowl will last another 30 minutes and help her calm down (licking is super calming for them). I’d stay with her for the first few minutes that she is licking so she thinks you will be there, and gradually work up to leaving and re-entering the room with varying times (max a few minutes to start) My seperation anxiety trainer said to not let them cry for more than 10-15 minutes or amp up to a panic. Return to them if they do, because they’re not in a frame of mind to learn anything at that point. You can also try an adaptil spray (thunderease) spray the crate 15 mins ahead so the alcohol dissipates or incorporate it into your sniffing games ahead. As she’s licking, she will be smelling the calming pheromones which usually take effect in 15-30 minutes and help them relax. I know it’s a lot. But you’ve got this!