Hm, in a way yes and in a way no. I mean at the time she had no real reson to join, she was young and in love with no children (were Bill and Charlie born then ) well if so than she wanted to protect her family by any means necessary, even if it meant preparing meals for the Order and being there for moral support. At the time things were diffrent, no one was prepared for a battle like this and death was imminent, so it was naural for anyone and everyone to join the good/bad sides.

Though I think it did make an impact on her joining. She wanted to prove to herself she could do somthing like this, avenge her family in a way.

I'll think more about it in the morning when I'm more awake.