Aw

maybe she's getting a cold, or something else is bothering her?
(I'm sure you may already known this or have tried it) But talk to her in a quiet and calm voice and try rubbing her stomach(or back) after settling her down on her bed. It can help calm her down,or try decorating her room with more calming colors to help ease her mind when she goes to sleep(or give her a warm bath before hand). These things usually helped me out, but then every child is different so it may not work.
Or if you really can't take it anymore tonight, why not have her sleep in your bed with you(just for tonight) that may help so that both of you can get some sleep.
I know it's hard, and wish you the best of luck. Just remember that eventually this will past, until then just try and remain calm and keep an even mind

Again, good luck!