If you google introducing solids you might come across baby led weaning (BLW). BLW is an approach that skips purees and spoon feeding altogether and encourages baby to eat whole pieces of food starting at 6 months.
Readiness for solid foods is very much a developmental milestone, like taking, crawling and walking. Each baby will be ready at slightly different times, based more on their ability to eat food and to tolerate it. One thing we can rely on, is that your baby knows when she is ready!