It sounds like your feeling better about things but I thought I'd say hi and add my two bob's worth, for what it's worth. grin
First of all, kick those teenagers up the butt!! I can't believe their mother allows them to speak like that. That's really low on both of their parts.
Secondly, you are a fantastic mum so please don't tell yourself otherwise!
But I know exactly how you feel when people make those kind of comments and the doubt it plants in your mind. It's been happening to me too mostly because my DH is constantly worried about DD's development and says it all the time. "Why isn't she walking??", all the time, it does my head in! I've had to tell him to cool it on several occasions. Our DD didn't crawl until the week before her first birthday and at nearly 17 months, she isn't walking yet either although she did take her first few solo steps (very tentative) on new year's eve. Yay!! (Of course DH compares her to her cousin, who walked at 8 1/2 months!!!)
I agree with the others - it sounds like she's absolutely fine and doing things in her own sweet time, just like my DD is. But if you're really worried, have her checked by your health nurse, it can't hurt for your peace of mind. I did with DD when she was about 10 1/2 months and showing no signs of crawling and the nurse did a thorough developmental questionairre and physical exam and found there was nothing wrong. She was ahead of her age in other areas too, which put my mind at ease.
Take care and I hope your mind is more at ease now. Cheers. smile