I gave 糊仔 / congee to my BB in 5-month old. It is not late. The reason why we need to give solid food to BB eat is for let me know how to chewing. Milk is still important to BB below 1-year old.
You can try to give 糊仔 / congee to your BB in lunch time little by little. If she eat well, you can try to give her in dinner, too.