can you let me know what is the criteria for Wajib namaz and Roza for girls is it age or puberty of age what is the age for girls

When she will her 9 years according to Islamic calendar inshallah she will become baligh
You can calculate by applying formula that on average there is a difference of 11 days .islamic year has 11 days lesser than ad calendar that means she will become 99 days before her birthdate