12 month old waking for hours in the night

[KD0706]

DD2 is 12 months old (was 8 weeks prem so if taking that into account she's 10.5 months).

Always been good sleeper, waking for feeds then going back down to sleep etc.

But lately it's getting worse and worse.

Routine used to be

Up between 7.30-8am
Nap 11.30 - usually about two hours
Bed 6.45pm.

A few weeks ago she went through a phase of waking at about 9pm for a couple of hours each evening. But I put back bedtime slightly to 7-7.15 ish. Which stopped the evening wake up.

But now she's waking at 4am ish and taking up to two hours to go back to sleep.

On my mums advice yesterday and today I've restricted her afternoon nap to just 90 minutes and last night put her to bed late - about 7.45. But last night was just the same. And she's actually asleep now (4pm) because she was so knackered

Any thoughts... Go back to the old routine and deal with the 9pm wake up??

Thanks

Also, she won't co sleep, just pushes me away and yells.
Won't feed to sleep.
Doesn't particularly like being rocked to sleep.
Gets cross if I do shush pat.

Well, bit of a bump and an update. She was much better last night. Woke twice but settled quickly with a feed (for now I'm just feeding her as I can't face losing any more sleep).

She was up at 6.30 for the day which is early for her. But I can cope with that if it means I don't have to pace the floor for hours during the night.

My plan is to let her nap as long as she likes but to stick with the later bedtime. 7.45 last night - but I don't think that's too late in the grand scheme of things