I'm feeling for you. I remember it well, it feels like it will never end, but it will .

Some settling suggestions I'll throw at you:

* Does she like the bath? Maybe a bath and massage will help calm her down.
* Could she have wind issues? DD had awful wind issues, I used Infacol before each feed (you can use Infacol from 3 days old, despite what the bottle says - my MCHN told me ) and would stop feeding her every 4-5 minutes - burp her - then put her back on. This made a huge difference. A friend has a bub who had really bad wind. She started bathing her twice a day and it has completely fixed the problem.
* Can you get your hands on a baby hammock? I used one for DS1 (and now with DD) and it was a life saver. He would only sleep in my arms until we bought one. They are great if your bub has reflux too, because it keeps their head raised. I would put DS1 in his hammock and bounce him off to sleep in it and he would stay asleep. If he woke up, I'd just bounce him again.
* It could be reflux, I am no expert though! It might be worth chatting with your MCHN or GP.
* Take her to a paediatric chiro. They have great success with unsettled babies, they can resolve issues like colic, relux, wind, etc. The one I take my babies to is extremely gentle, no bone "crunching". This might be the answer you are looking for, it was for me!
* Settling in her cot/cradle: A trick that worked well for DS2 was to wrap him tight, put him on his side, pat his back and make a loud "Shhhhhhhhh, shhhhhhh" sound in his ear. He would settle pretty quickly and once he was asleep I could roll him onto his back.
* Keep persisting with a dummy! I know it is annoying, but she might eventually take one. It took 3 months for DD to take one, but it was a lifesaver when she finally did! We use the Avent ones.

I hope I haven't overwhelmed you LOL! I just thought I'd throw some suggestions at you

Your DD1 will be fine, this stage won't last and she won't remember it, I promise . The waking overnight might just be because of all the changes. Both my boys did this to me when a new bub arrived and it did pass.

I hope things get better for you soon .