Her eyes aren't obviously crossed but if you look in her eyes you'll see your reflection dead centre in one pupil, but at the edge of the iris in the other. Or in a flash photo, though subtle, the light flash is at slightly different points in each eye, eg on the white in one and the iris in the other. It's fixed, not occassional or changing in degree.
I've looked at my others, they always show reflections at the exact same point. Does anyone have experience of this at this age? My others did occasionally squint at this age, but it was only on focusing and resolved quickly.