1 hr sessions must be too long for her, seeing as she has never been apart from you. Speak to the child’s worker in the nursery, and ask for the time to be built up more gradually.
It’s actually very common for babies to get upset during setting sessions, and it’s also normal for parents to be asked to return to pick up a baby if they become upset during the settling in session. I know it’s hard to see your baby getting upset, but I’m a bit surprised that the staff in the nursery didn’t reassure you that this is usual.
I worked in a nursery - but we had 30 minute settling sessions for babies and would build it up.
The parents would stay for the first visit, then wait in the parent room for the next visit, so as they were nearby and could come back into room right away if the baby got upset.
We would continue this until the baby was comfortable with us for 30 mins, and after that parents would drop them off for an hr.
We would then extend the time, to include staying for a snack or bottle, then staying over lunch, then a half day including a nap etc depending on the babies routine.
It does take time, and every baby is different, but never worked with a baby that wasn’t settled after a month. What you have described is normal, and as pp’s have said, it’s usually just a matter of persevering.
Your baby will pick up on how you respond to to going to the nursery and how you interact with the staff in the room.
My advice for your next visit would be to interact with the staff like you would your friends, chat to them and take an interest in resources in the areas of the room and stay and play with your baby.
Bring a familiar item from home, like a blanket or toy that they like, as this will provide them some comfort.