Don't want to sound abrupt but this will be a quick reply as I need to get off the computer!

I personally agree that you shouldn't be switching beds or giving the option of chooosing a bed. Her bed is her bed, there should be only one, and she needs to get used to it.

When I introduced both my DDs to their big girls' beds they were 2 and a half I think... and we just had a rule that once you're in bed you stay in bed. UNless you're feeling sick then you can come and get mummy, or unless you need to go to the toilet etc. But other than that - if they got out of bed - then it was straight back to bed, led by the hand, just quietly said to them "back to bed buddy, sleep time now, we don't get out of bed at night time, til the clock starts with a 7 (digital clock in their room)" etc.

We have had a few nights of wild excuses... "I can't sleep because... because.. um... because... I had a dream about... um... a frog".... so then straight back to bed with the spiel about not getting out... and being firm but kind ... and consistent.

Good luck.... frustrating isn't it... hope it all fixes itself soon.