Not sleeping through the night!!!

My little one is 14 months and has never slept through the night. I work a full time job and with a 45 minute commute I am beyond tired. She wakes up twice a night. Once about an hour after I put her down to sleep and then again around 2:30 am. I tried wake to sleep for the first time she wakes up but it only worked for a few days. She naps twice a day anywhere between 45 mins to 2 hours. She wakes up at 6 am and I try to get her to bed at 8 but it's a battle to get her to sleep and sometimes she won't fall asleep until 9:30 pm. We've tried CIO and were unsuccessful. She get so emotional that she goes from crying to uncontrollable sobbing. She can't stop crying even when I console her and continues to sob after I pick her up and rock her to sleep. She is still sobbing in her sleep. And sometimes the sobbing keeps waking her up. Please help!!! I don't know what else to do.