Re: 6 Month old will not put weight on legs.
I don't think it will hurt anything to get her checked out. There may be something wrong or it just maybe her personality.
FWIW--neither of my boys sat up unassisted and barely assisted until 7 months, crawled at 10 months, and didn't start pulling themselves up till 10/11 months and didn't walk utnil 16/17 months. Both were very layed back and content to do things in their own time. There was no way anyone was going to force them to meet a milestone before they were ready to do so. They are still that way.
wife and mom-- no other special labels. Just trying to do the best I can.