I kept the monkey up until 10:30pm, to ensure her fatigue. I was also thinking that, if her sleep is no longer at the 11-hour stretch it used to be, then when she wakes it will still be at a (relatively) reasonable hour.
She came and got me out of bed at 8am. This means she probably woke up around 7:45am. Which means she slept for 9 and 1/4 hours.
Which means we need to remember this, when putting her to bed, so she doesn't wake up at 3am.