Sounds like she has her night and day muddled up.
Maybe try getting her up at about 7am (ish) tomorrow regardless of what time she finally nodded off (last thing you'll feel like doing, I'm sure) implement the eat, play, sleep routine and try to get her back to sleep 45-60 mins after you woke her up.
Then for the rest of the day wake her for 3-4 hourly feeds with some play time each cycle, even if it's just a few mins on the playgym with the aim to have her back in bed 45-60 mins after waking until late arvo.
Then do you bath/bedtime routine and see if she'll go down for a decent period.
Treat any wake ups/feeds from that time on as night-time with dim lights, no noise, minimal talking/eye contact etc.
Good luck and also check out The Sleepstore website, they have heaps of useful info
Edited by Danda08