Questions about new pup

We just got our pup a few days ago. She's 5 to 6 months old and super sweet. We literally haven't heard her bark once... we've joked about her possibly being mute. She shows no interest playing with any toys. She just wants to sit on the couch next to us wrapped in a blanket and nap. She won't jump, we have to pick her up and put her on the couch. She's eating and drinking fine. The one thing she does love to do is to go for a run with my wife.

Any tips on getting her to be less skiddish and more outgoing?