I started out with a Sherpa bag that I had with Molly. Since I took her out to go in short trips as well as visits to my daughter's. Molly associates the bag with going out, which she loves to do. So, when I first used my Kwigy Bo Alexa bag with her, she willingly jumped in. I also have recently purchased a travel harness which I have used with her a couple of times. She likes being able to sit on the seat next to me while driving. But, she still goes in her bag when going in stores, etc. I intend to purchase a stroller to use for the beach, flea markets, etc.
Good luck with your baby. Once she recognizes traveling in a bag is a good thing, she'll willingly go.