I’d agree in the 10-14 month range. The horn color on the beak is one clue. Also, it’s hard to tell but it looks like she MIGHT be starting to get a blue eye ring, an age-related right of passage for Solomon island eclectus females, which yours is likely.
Basil - 22yr male SI Eclectus
River - male GCC
Nemo - female BCC - handicapped
Summer - female pineapple gcc
Rainbow - male yellow side gcc
Lando - male black headed caique
Paprika - female SI eclectu