Don't know if you're willing to try this but we had similar issues and about that age we took the mattress out of the cot and just put it on the floor. (I was willing to try anything) We found that she slept a lot better that way and after a couple of months of that we got her a bed. Now don't get me wrong, we still have 1-2 wake up calls a night but USUALLY she goes back down quite quickly. I found with the mattress on the floor it was easier to resettle her cause I could just lie down with her and pass out!
Don't know if that helps but I feel your pain and lots of
ETA another thing that seemed to help was night weaning her at about 13 months (I don't think it would have worked earlier for her), although with a recent illness we fell off the wagon there a bit so have some work to do now