oh yes, more time needed. I've had a hell of a time settling my 13mo. We started at one place (nursery A) when he was about 7 months. He was fine the first 3 settling in's - then he was quite ill. I think it co-incided with the onset of separation anxiety, because he screamed blue murder from then on. The nursery kept telling me to go away and he'd calm down, but that never happened, resulting in one hysterical little boy, and I'd come back after an hour to find him practically hyperventilating. I asked to stay with him to get him used to his surroundings but they wouldnt have it, and it got to the point where we approached their front door he'd burst into tears. We were trying every day for weeks but it didnt work. So I stopped trying as it wasnt worth his distress.
I started him at nursery B in January. I explained what he was like and said I'd like to stay with him as you are doing. They were brilliant and let me do this for a few weeks (probably about 12+ sessions before they told me to give it a go and leave him for an hour!). I had to creep out or he'd scream again. (not wave bye bye like everyone says) Apparently the first time I left, he looked for me, but didnt burst into tears when I wasnt there. That wasnt always the case though. We gradually increased it to a full afternoon. It took him a while to accept cuddles, nose wipes, nappy changes, feeds and so on, but we also took that slowly and he's ok with it now, apart from nappy - he hates that - but then he doesnt like me doing it either!
He now goes two afternoons a week (I'm breaking him into five afternoons gently) and he still can get very clingy when I take him, arms round the next and down my front kind of thing, wailing when I prise him off, but I give him a few minutes to settle, and the staff do their best to distract him and I disappear quietly. If I have to leave when he's looking, he still gets very upset, but calms down after about half an hour, which seems like a long time, but every time I pick him up he's happy as larry and doesnt want to come with me!
The point of my story is, some children do need the initial comfort of their parent because just leaving them to it doesnt always work, but you do have to make the break at some point. And she will scream. And if she's anything like my DS, he'll continue to scream everytime you leave, but will reach a point where he calms down soon (ish) afterwards. As she is clearly happy with her keyworker now, and she's used to her surroundings, the screaming is obviously for your benefit, because she knows you won't leave her. Thats what I keep telling myself ;)
I still have to ring them up and hour after I leave him to check he's ok (I'm very lucky and work from home so can pick him up if necessary) but he's always fine. They usually tell me he was either fine when I left, or that he was quite upset for half an hour, then fine after that. I trust them to tell me the truth. They've also started taking the litte ones outside to play, which has worked wonders - he's far too distracted to think about me!
Good luck