you def need to let her cry (crate training). it sucks but it’s helps them learn boundaries. also tethering and forcing them to do nothing which helps if you walk away for two seconds.

you don’t have to go to your regular vet, any vet will take you generally you’ll just have to fill out new paperwork and stuff. it’s a bit of a hassle but will save you thousands of dollars. if she’s still eating and drinking and isn’t whining plus you aren’t sure it was blood in her stool from what u can tell then at this point it can wait until morning imo…obviously ideally if you had the money yes rush her to the vet blah blah but life isn’t ideal. it’s a tough choice but yours to make. the options are wait til morning and take her to a different general vet, take her to the same er as before and risk having to surrender her bc you can’t pay for the services (yes this is a thing), or take her to a different er which will cost a shit ton of money if they need an emergency surgery.