aw helen, i DO know how you feel, i think. I have 2 bad sleepers, but dd was appalling. I was severely tempted by CC when dd was about 18 months, but talked it through on here and decided to hold out for a bit longer. And then dd started sleeping!
Personally, before i tried CC, I'd co-sleep but give it a real go. First, kicking you in the head is not ok. If she does that, one way round it is for you to move round so you are next to her. But also, explain to her that if she does that, she WILL have to go in her cot. You do need to be firm about not being kicked, IMO, if its deliberate, its quite fair to do this.
You need a big bed, with just you and her in it for the first few nights.
There is absolutely no way CC would have benefited dd. She is, at night, quite timid and clingy . In the day she is actually quite confident, and getting increasingly so, but this is very much subject to me being there (this need is decreasing). Some kids can clearly take it-ds might have been ok. But it would not have helped her at all. Do remember that-kids are very different, different things work for them.
oh one other thing. A LOT of kids I know seem to be sleeping badly atm, I think because of the long days.
Is there any way that you can get sleep? Hang on, is you partner helping here? Could you do shifts and go to bed early ?
And remember-this is TEMPORARY. She WILL be sleeping better soon, whatever you do.