Is my puppy gaining weight like she should be?

Her diet sounds good to me. Eventually you will want to add a wider variety of protein sources (pork, venison, turkey, lamb, mutton, rabbit, bison, goat...)not necessarily all of those, just a little more variety to keep her interested and cover all your bases nutrient wise. You may want to find a raw food co-op near you and take advantage of the bulk prices on quality raw. I get mine from a company called mypetcarnivore and they offer lots of variety, the meat is hormone/antibiotic free, free-range, & grass fed so I don't have to worry about all the crap they put in grocery meat both while it's living and after slaughter. Two pounds in 8 days is a healthy weight gain. Growth that is too quick leads to orthopedic issues so the slower the better. Genetics determines eventual size; overfeeding just leads to a fat unhealthy pup. You are doing everything correctly. Keep up the good work and good luck with your new pup!