Hi, hang in there. My daughter did the same thing. Every evening at around 5:30 she would only be content if someone, usually me, was holding her. After getting checked out at the doctors my peditrician said it was a probably a combination of boredom and the need to be held. Every baby needs a certain amount of cuddling in a day and if she isn't getting it at daycare then that leaves it all for the evening.
As my daughter got older she settled down a lot and she could be entertained by toys and my personal favorite Baby Einstein videos. When I needed 20 min with no baby in my arms I would put on either the Baby Bach or the Baby Neptune and she would be ok. However I did eventually master the art of doing things with one hand or with the baby in a front carrier, which saved my sanity.
Just hold on, as long as she gets a clean bill of health at the doctors, it will get better.
God Bless,
K.