UPDATE!

Just when I thought things couldn't get worse! In addition to all the problems I mentioned in the initial post, now she's started waking up every 2-4 hours... she hasn't done that since she was about 4 months old!
Who knows what's going on!
I was very happy with her 9-10 hour stretches of sleep - sure, I had to wake up between 4.30-5.30 to feed her back to sleep until 7ish, but I at least got 8 hours sleep in a row! (I go to bed early)....

I'm not sure if it is related to her currently fussy eating?
I really hope it isn't because she needs the boob to fall back to sleep whenever she wakes up at night?!! Well she's capable of sleeping through, because she has done it before, albeit briefly.
For a few nights before she turned 10 months old, she slept 11-11.5 hours a night... lovely!