One thing to note--being splash does not preclude her from also being lavender--the appearance of a bird who is BlBl (splash) and lavlav (lavender) carries some of the characteristics of each--splashing will definitely show.
Other than her light base colouring, do you have any reason to suspect that she is lavender?
Other than her light base colouring, do you have any reason to suspect that she is lavender?