I don't think you read her wrong at 12 pm. If she woke up crying after 1 hr, then she must have been tired. So, I think you did the right thing by putting her down at 12 pm.
I think she should be fine with a 6 pm bedtime. This early bedtime is only temporary, and let's keep our fingers crossed for tomorrow morning, but, I would try to go for a walk and do something very very relaxing so Daisy lasts till 6 pm. When I have a short nap and a long way to go till bedtime, I usually go for a walk in the pram. This really helps Patrick relax and doesn't get OT nor OS. If he is crawling and cruising during all his A time, he gets really tired. The same goes to Daisy. Try to have a looong walk with her in the pram. Ask your DH to go for a walk with Benjamin and Daisy so she can relax and doesn't get OS nor OT.
If she does get an EW tomorro, at least we will be sure she is not OT so we can start pushing the day back, iykwim?
I've been reading my notes about Tracy's books, and I just re-read that Tracy recommends PUPD for the EW. I know you don't like to use PUPD with Daisy, but if she is waking up crying in the early morning, then try wiwo/pupd for getting her back to sleep.
Lucy, if you think Daisy is hungry at 4.50 am when she is waking up, then DO feed her and try to tank her up during the day. Where are you feeding her? In her room or do you take her to your bed?We need to make sure there is nothing else going on that is making Daisy wake up so early. Do you have black out curtains? Neighbors going to work that early and waking her up? Do you think she may be cold at that time? It gets colder in the early morning, so may be go to Daisy at around 3 am, and cover her with a blanket just to rule out this possibility.
Do you think she is teething? May be that's why she had such a restless night? Cold/Heat?
How is Daisy falling asleep for naps and at bedtime? Could you describe your wind down routine and let us know how she goes to sleep?
I'm glad you're going out! I hope Daisy behaves herself tonight!!
Hugs
Alexa