4 couples picnic puzzle

4 couples decided to go on a picnic together.
Dana ate 3 sandwiches, Alice ate 2, Nina ate 4 and Maria ate 1.
Jason ate as many sandwiches as his girlfriend,
Peter — twice as much as his girlfriend,
Alex — 3 times as much,
and Nathan — 4 times as much as his girlfriend.
Together, they ate 32 sandwiches.
What is Alex’s girlfriend’s name?

