Don't let others get you down, you said yourself that you have done all sorts of tests and she is fine! I don't think I'd worry too much about her weight, lots of babies are smaller. My dd was often "off" the charts after 8 months of age. The highest she ever got was the 10% mark! Now, at 4, she is normal height and slim, she's also smaller boned so I doubt she'll ever be heavy.
I would still continue to offer solid food at every meal, not make a big deal out of it, but offer it. You don't want her to get a negative association with food, so try to make it fun, even if she doens't eat it. How much milk and when, is she drinking it? Do you think if it were cut back, she would take food in?
