Co-sleeping, Cribs & Pack-n-plays

My youngest daughter used to be the best sleeper in the world then our Christmas vacation to Nana's and the big move coincided all at once. Here's the problem- she won't sleep at all in a crib or pack-n-play or bed unless someone is laying down with her! It all started when we arrived at my parents house over Christmas. She would SCREAM forever well it seemed like forever. And the grandparents couldn't bare to hear her crying so they would put her in their bed.  Then she wouldn't take naps, so someone would lay down with her.  Then my hubby and I had to leave the kids for 2 weeks so we could finish packing up our stuff in Texas, meanwhile baby girl refused to sleep unless someone was laying down with her.  I get back and try try to "fix" the problem.  Since she wasn't sleeping in the crib, we took it down and put up the pack-n-play. The little stinker figured out how to climb out of it- NONE of my other children EVER climbed out of the crib or pack -n- play.  So now I am stuck co-sleeping with my 19 month old.  It's horrible, really, why any one would enjoy sleeping with their children is beyond me! I can't sleep for fear of rolling over on her, or that she might get caught under the covers, etc.  What am I to do???  I am tired, and I would like to get her back to being the good sleeper that she was.  Any suggestions?