It's hard to imagine the emotional tumult of feeling distant from Lucy - this all happened so fast that the newness of motherhood hardly had time to wear out. Maybe you could take solace in the fact that once the twins are born you'l be able to reconnect with Lucy, and you can hand twin duty over to Jay! But honestly - I think that this might be a blessing in disguise. Lucy is young, and dare I say, forgetful. Imagine this happening when she was older - your distance from her or inability to care for her might not just cause changes in behavior (calling Jay 'mama'), it might cause actual behavior issues (tantrums, acting out, etc).
My second word was 'pickle'. I used to pull on the fridge door and say 'pick-le, pick-le, pick-le'. Just thought I'd share a little story about my personal language development.