1 Year old daughter not crawling

My daughter turned 1 on Xmas eve and is still yet to crawl.

She can roll really well and sort of commando crawls if she needs to get to anything. She can also sit herself up from lying down. She is yet to pull herself up onto something, she is trying but can only get onto her knees and not onto her feet yet.

I stand her up at her cot and she can stand for quite sometime but her legs are super stiff.

I haven't been overly worried about it and have talked to plunket nurse who said she isn't worried either. But just sick of hearing people saying she should be crawling by now or something must be wrong

Just wondering if anyone else is, or has been In the same situation with their Wee one!