My 8 week old goes to sleep soundly then and hr or 2 later she crys hysterical.. i pick her up she goes right back to sleep.. why does she do this?

Reassurance: At 2 months of age, your baby hasn't developed the ability to sooth herself back to sleep yet when she awakens. By picking her up, you are reassuring her everything is okay. Over the next several months, she will develop the ability to calm herself and go back to sleep on her own. If she is not consoled when she cries, look for other reasons (fever, infection, injury, etc).

Needs mother touch: It is true sometimes baby cry on ly to be with mother it is a known.fact ,they want physical contact .But you should check her diaper(if wet) or there is no object in the bed which makes baby un comfortable or this may be feeding time .But as you say that she goes to sleep aafter you pick her up,that means she needs physical touch