If she's otherwise healthy and active, I'd suggest you not to worry about weight. She looks healthy to me. From my experience, I can tell you that female dogs don't get too much weight in their younghood and mostly in adulthood.

At most give her a shot of ivermectin.

Our dog put on weight when we started feeding her white rice. Which the vet wanted us to do occasionally throughout the day to make sure she never has an empty stomach. Due to her intestinal issues she gets a lot of buildup of bile and needs the rice to absorb it or she will throw up or have diarrhea.

She still eats her regular 3 meals a day of dog food but every few hours we give her a handful of white rice.