I agree that that's a lot of change for her but that it's no fault of yours.
My DS also turned 2 and changed rooms very recently. He's been in there nearly 2 months now and he's finally starting to settle. How long has your DD been in her new room now?
My son used to adore going to nursery. He has a best friend there who he couldn't wait to see every day. When he changed rooms his best friend moved with him so he'd have a friend but it wasn't enough. He found it tough and acted similarly to your little one. Many tantrums for no apparent reason when you wouldn't expect them.
We summed up everything that had changed and tried to see it through his eyes.
He didn't know or trust any of the new nursery staff in the new room.
He only knew one child (his best friend) and everyone else was bigger, louder, older and better spoken than him.
He didn't know the new room's routine.
The new room was in a different building to the last one.
He had a new bed to nap in.
He doesn't like change and that's a lot of change at once!
He used to run into nursery and wave me off with a smile and a blow kiss. During the first month in the new room he frequently begged me not to take him out of his car seat, asked to go home on the way there and I've had no choice but to carry him into nursery with his tear stained cheeks pressed into my shoulder. I know once I left he calmed down and had a good day though. All smiles when I went to pick him up later that day!
He's doing better now and will walk in willingly whilst holding my hand. No more tears and we've had the odd day where I get a smiling wave and blow kiss again!
Also, speak to the nursery staff and see what they're doing to help. We put a plan in place with ours where they offer DS his favourite toys or books from the room as soon as he comes in to get him on side. They also have art displays and pictures on the walls with animals, vehicles etc. They'll say something to him like "Do you want to come with me, have a cuddle and count the ducks on the wall?" and he's normally happy to go with them and do it. He gets the contact and reassurance he needs whilst also getting to count his favourite things.