dont let anyone make you doubt yourself EVER!!! they recoment introdusing solids at 6 months, but it is entierly up to the parent, you yourself will KNOW when YOUR CHILD is ready, just because hers were (im assuming she has a child?) dosent mean your dd will be ready at the same time to!
for what its worth, my dd is 10 months old and still isnt all that keen on water, only the last month have i got her to have even so much as more then a sip! befor then, she would realise its not milk and throw the bottle/sippy cup and scream at me for her milk!!!
remember all children do things and are ready for things at THERE OWN PACE! no one elses!!