Oh that's adorable A friend of mine's daughter does this, she still just can't get the hang of crawling. She's 13 months old and has now changed it to one foot kind of out in front, she uses that to pull her bum along lol, it's so cute! Now that she can do that she doesn't even bother trying to crawl, she gets along quick enough like this. I don't think it'll affect her walking, she walks while you hold her hands etc.

Your daughter just has her own unique way of getting around, good on her for figuring it out