Question

Ma saraswati ko वीणावादिनी kyun kehte hain

Answer 1

because maa sarsawati bhut hi acchi vina vadak thi aur unke vina ki awaz logo K man ko khushi se bhar dete the....

Answer 2

Because there is the musical instruments Veena in her hands and she plays it.
Veenavadini means Veena + Vadini
which means the one who plays Veena.
Hope helped..