Sounds like she just wants to be close to you. Mayb wrap her a little tighter or put something in the bassinet that has your smell on it. At 4 days old.. no i wouldnt give her infants friend or anything for that matter. She is still brand new so you might find it will cause more problems than good. Also being FF at 4 days old is probably giving her a little tummy ache, so she wants her mummy right now.