Formal:
* Magandang araw po, Lola. (Good day, Grandma.)
* Magandang hapon po, Lola. (Good afternoon, Grandma.)
* Magandang gabi po, Lola. (Good evening, Grandma.)
Informal:
* Hello, Lola. (Hello, Grandma.)
* Kumusta ka, Lola? (How are you, Grandma?)
* Lola, kamusta ka na? (Grandma, how are you?)
You can also use "Manang" instead of "Lola" for "Grandma" in a more familiar and informal setting.
Example:
"Manang, kamusta ka na?" (Grandma, how are you?)
The choice of greeting depends on the context and your relationship with your grandma.