My DD was exactly the same and I hate to say it but really you just need to let her do her own thing. My DD was certainly not manipulating us by not walking. She as a person is very cautious. And I think this is why she crawled at 11 months, and walked at 18 months.

DS on the other hand has no fear. Crawled at 5 months, stood at 6 months, and was walking by 11 months. They are all different. Oh and DS had way less tummy time than DD.

BUT if I said I wasn't worried. I would be lying. Please know it's normal to feel the way you do. But hopefully I can help reassure you in some way. Because it was the reassurance I didn't have. Instead I got told she'd have bow legs, she'd never do sports, she'd always be lazy or uncoordinated. But she isn't any of those things