(((hugs))) I am so cranky too! I'm finding it hard to enjoy my LO as I get so frustrated when he doesn't sleep well. It's awful, but I keep asking myself why I decided to have a #2. I feel like such an awful mother for even thinking that.
With the crying before naps, could she have some separation anxiety due to the teething? Sometimes that happens with some. Do you give meds before the naps? It could also just be discomfort with the teething? They may handle the pain better when they're up and busy playing but feel it more when they lie down.
For the broken nap, I would go with the middle time as well. I have the same problem when I try to apop the nap. He'll keep waking up and I know it's an OT sign for him. But these days I pretty much can't apop anymore. I used to be able to hold him in my arms and let him sleep but now he hates being held sideways and he fights shush pat now. So it's super hard for me to extend naps now...so I'm even more screwed!