Welcome to YT!
As others mentioned, your baby was taken from her mother too young. So you'll have some difficulties due to that aspect.
But, with the crying.. it's quite normal. And the difficulties dealing with it - that's quite normal too! We've all been there, but don't worry you'll get through it. You can liken the whole crying thing to when moms have to sleep train human babies - it's not easy, but you have to train them to sleep on their own.
I had my fair share of sleepless nights, for a few months actually. I opted for crate training with my Scottie because I wanted him to be outdoor potty trained. He HATED it.
First though, we went through a lot of training to deal with the separation anxiety. You may want to look into that first so that your baby can be left in her pen alone without freaking out. Basically you leave her alone at small increments of time and reward her each time she's quiet when you come back. Start with a few minutes and increase to 5 minutes, 10 minutes etc...eventually an hour, two hours etc.
I had to do this so that Scottie didn't bark or make noises while I was out as I live in a condo. It's always very important you train them that it's okay when they're alone for their own mental state of mind. And it's good to start training this when they're very young. I took a week off work, but then again, I got Scottie when he was already 5 months old. At 9 weeks, you may need more time and patience...
For the non-stop crying - I tried many things. After training him to actually like the crate, each night I took him out every few hours through the night for potty relief.
When I knew it wasn't because he had to potty...
I covered his crate - partially covered, fully covered etc. I left him something of mine that had my scent. I put a loud ticking clock over his crate to mimic a mother's heartbeat. I put his crate by my bedside.
Eventually after reading everything I found on the internet, I let him just cry it out. When you attend to them each time they cry (and it's not a potty cry), they learn that they get your attention when they cry. It was incredibly hard to ignore the cries. I'm sure my neighbours were super irritated. But it worked. After what seemed to be a few weeks. He finally stopped and eventually slept through the night.
Anyway, that was my experience. I thought I'd become bald from pulling out my hair! I'm SO glad it's over, but I very much miss his puppy days.
Good luck!! With puppies, it's a lot of problem solving, trouble shooting, and thinking outside the box.