Here's a breakdown of the phrase:
* "isa" means "one" or "a"
* "kang" is a contraction of "ka" (you) and "ang" (the)
* "dakilang" means "great" or "noble"
* "ina" means "mother"
Putting it all together, "isa kang dakilang ina" literally translates to "you are a great mother."