She will choose from 1 of her 3 cousins, 1 of her 5 neighbors, and 1 of her 2 sisters.
She has to choose 1 from 3 , So here she has total 3 options available.
Then she has to choose 1 from 5 , here she has 5 options available .
And at last she has to choose1 from 2 , here she has 2 options available .
Now to find out the total number of combinations available = we multiply all the available options
So total number of possible combinations are = 3*5*2 = 30 combinations