Vaa vaa

As of today, C utters the following words:
appa,
amma,
Oh-oh,
vaa vaa,
tha,
tha tha,
Hi.
We are not sure, how many of them she actually understands. She still cannot figure out, if we point something to her. While pointing, she just looks at the finger, and NOT at the objects being pointed to.
Even though C started saying "appa", long time back, D has successfully made C forget that word and instead taught her "amma". C also says mummy sometimes, and we dont know where she learnt it from.
Whenever we picked her up, we said, "Vaa". So, the meaning for vaa for her is to pick up and she would come to us, put up her hands in the air, and say "vaa vaa".