6 month old having some dependency problems

My wife and I have been doing pretty well with our 6 month old girl, she's been able to sleep through the night since the first week, etc. But in the past few weeks she's become completely dependant on mom to get her to sleep. I used to be able to put her to sleep every night but now she struggles every time. However, we weren't too concerned about this until more recently.Now she absolutely needs to be around mom when she is tired or hungry. I can't bottle feed her anymore (was just fine until this week). She starts to eat and as soon as she sees me and that it's not mom, she throws a fit and won't eat any more.This is a concern to us right now because tonight we are going on our first date without her. The friend-couple who will be babysitting her has been around her for awhile but we don't even know if it will work. Any advice on what we can do? via /r/Parenting http://ift.tt/2bcIzX4