M.K.
I say she is only 7 weeks old! At this age they cannot comprehend crying it out! If she needs to be comforted to go to sleep then comfort her she will eventually do it on her own. Lay her down after she has fallen asleep and try the carseat worked wonders for us. How about someone else holding her? Also I wouldn't call this a phase unless being a baby is a phase. It gets better I promise this is only a short time of her life where it seems like you might never sleep again :)