R.S.
If she is walking, let her put her doll in the stroller and push it for a few minutes, then tell her it's the dolly's turn to push her, put her in and hold the doll at the handlebars. I also carried mine sometimes (yes, even when pregnant) in a sling, which you can use while carrying her on your hip to support her bottom. You can try finding a toddler exercise video and both of you do it together (my mom lost lots of weight doing "chicken fat" on TV when I was little.) If she hates sitting in the stroller, she's probably bored, same as when she gets her diaper changed, so take comfort in the fact that she's probably very intelligent.