looks like your activities are full whole day... and there does not seems to be any chances for the extra calories to pile up.
so, where does the extra weight comes from ?

For your height, i think you are considered 'giant' and 'tall' for asian female.
and probably much of the weight comes from the bones density...

I'll suggest you to have earlier dinner from 6pm - 7pm.
And try to drink water whenever you feel like snacking in between lunch/dinner.

btw, whose baby is it ?