I'd say to wait until she's 3 years old, or you can start when she's near but the formula ran out (eg. 1-2 weeks before she turns 3 then stage 3 runs out). Another alternative is to consider fresh milk instead, because her main source of nutrients after 1 year old should be from food and no longer from milk - unless she has any medical requirement :)
for me, i will wait till she hit 3yrs old then i change to the next stage. but currently im giving my kids pediasure. no need change from age 1 to 12 😊
At 3 she doesn’t need formula anymore. My little one is fully transitioned to cows fresh milk
At this age, you can give her cow's milk. I gave my lo Meiji fresh milk...
Cow's milk is good