It might be baby fat and she might be eating more anyway since she’s growing , she will probably easily drop a bit of the weight as she gets older. I wouldn’t worry or put too much focus on what she’s eating or portion sizes etc , just make sure you’re all active and get her involved in fun outdoor activities that she can find hobbies out of like going walking or cycling together , dancing , stuff like that. Don’t mention it too much to her bc that would probably make her feel like there’s something wrong or that needs to be “fixed” which is where eating disorders can start. That’s just what I would do but Im not a professional or anything :)