Nighttime crate disaster

I’m new to this forum so I don’t know if this is the right place to ask this question but here goes. I picked up my 8 week old Shih Tzu puppy today. This is the third Shih Tzu I’ve had but it’s been a long time since I had a puppy. She was great all day except she cried if she couldn’t see me or my husband. Face forward to nighttime. She was out cold on the couch and when I put her in her crate to sleep she stayed asleep for about an hour. I have her crate next to my bed with a pee pad in it and a towel. She also has some toys. As soon as she woke up she peed and pooped in the crate. I took her out, changed all bedding, and put her back in. She started screaming and whining, which i expected. What i did not expect was the diarrhea that soon followed. So now she’s covered in poop and I have to give her a bath. I bathe her and take everything out of the crate because it’s covered too. It’s midnight now and she is asleep on the couch and I’m afraid to put her back in the crate because I don’t want a repeat of the diarrhea. I’ve been down this road before with a Shih Tzu who turned out to be completely unmanageable to the point where he was hurting himself and needed to be put down. I’m not saying my new baby is like that, but I don’t know how to handle her having diarrhea in the crate because she’s upset. I know she’s not sick as her two other poops today were solid. I don’t know what to do and I have no assistance. Any suggestions?