Yes, she mentioned that he dad was out of town but you would think that they too would have a safe at their home she could access instead of resorting to stealing from Lavanya, don't you think?
I'm sure this was just a way to bring her down a notch and have Paakhi hear the recording left for Girish but still, I thought it was a lame excuse for her stealing from Lavanya rather than getting some money from her own house and her own or her dad's safe.
I'm sure they could have found another way for Paakhi to find out about Lavanya that would have been more believable...