People aren't used to seeing a dog that is the proper weight. A couple more pounds wouldnt be terrible, but if she eats enough for her activity level, I'd ignore the people. I get those comments a lot. My collie was ideal and everyone thought she was too skinny. My staffy is almost to ideal pet condition. He was overweight when we got him, so we've been working on that. He eats 1cup high protein/cal kibble with a soft boiled egg or some raw meat 2x a day. He gets treats and puzzle toys during the day, so that's extra cals he works for.
Your dog looks to be of a smaller build than mine, so she shouldn't be bulky.
I'll include a pic of my Gimlet doing his favorite activity, walking on the treadmill, even though his stripes make it hard to see his condition. As a side note, her nails are super long and look like they're putting a lot of stress on her feet.
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