Sleep is a precious commodity at our house

Yesterday I posted my cry for help from my early rising boys.  Today they slept in till 7, which is wonderful.  However...
my daughter did not sleep much last night.  She wanted to, just not in her crib.  She wanted to sleep in my arms, all night.  She didn't want her soother either, just nursing - but not really nursing.  At about midnight I passed her off to my husband so I could get a little sleep.  He brought her back in around 1:30.  Again, she wouldn't sleep in her crib.  So we brought her into our bed.  She did sleep, but not well.  I lost track of how many times she woke up.  Around 5, I brought her down to the couch to sleep so my husband could get some rest.  She woke up twice more before 7.  Needless to say, when she went down for her mid-morning nap, so did I.
The culprit?  We suspect separation anxiety.  It's just in this past month that we've started leaving her to play in the nursery at church during services.  I was teaching Sunday School yesterday and I could hear her crying pretty much the entire time.  Today, she cried when my husband went to school (she's never done that before).  And every time I went into the kitchen from the living room she would either crawl to find me, or just start crying from where she was. 
So I am trying to figure out what to do.  I'm pretty sure the normal routine of our week with settle her back down again, but the fact is I have to leave her in the nursery to teach Sunday School.  I used to bring her with me, but now that she is so active she is more of a distraction so I can't do that anymore.  Next week, I think I'm just going to stay in the nursery with her to get her used to it again (I'm not teaching next week).  Any other suggestions?  I can't do the sleepless night again and function well for my other kids.