Contribute to wifes 401K or Roth while kids in College?

I have been fully funding my Wife's Roth the last couple of years. She is 45. She has a 401K at work where the employer does not match (they have a defined contribution plan). I ahve a duaghter starting college next fall and might be a tough squeeze to pay college and fully fund the wifes Roth and mine. My wife is currently contributing about $5500 to her 401k every year (about 10%). Should we put this in the Roth instead of the 401k while Daughter is in College? The tax savings on the 401K contribution is going to be negligible for me.