When should my infant start walking?

My baby girl is 12 months old and shows no interest in walking. She has hit every other milestone early but refuses to walk. she started crawling at six months and pulling up at seven. She will walk around furniture if she can hold onto it, but will not stand without holding on to something. I was just wondering when typical babies start walking because two babies that we know are b oth two weeks younger but already are walking. She can walk if she is pushing one of her toys that has wheels. is there anything we need to do as parents to help her or just let her figure it out on her own. When we try to get hr to walk to us she lifts her feet or crawls. Yes this is our first child......