Get her in her crib!!! If you don't work on this now, it will just get worse and will start affecting your marriage too!!!!
It takes 3 days to form a "bad" habit and it takes 3 weeks to break it. So you need to be commited for the long haul. Don't send mixed messages because it just makes the child more aggitated - stick with your plan. The Ferber method works great, but you may need to step into the backyard at times to take a break from hearing her cry. This hurts as a mom, but it actually hurts us more than our children. I found that a "lovey" like a blanket or stuffed animal slated just for sleep time should be given to the child at nap and bedtime - this is your signal to them that it's sleep time. Plus it helps sooth them..
Good Luck and stay strong.