I watched waterhorse with my family and we enjoyed it.
Sometimes my wife don't mind me watching boy movies... other times she hates it.
We were watching Auther and the Invisibles once and she said, "Why am I watching this with you!" and left the room.

I guess females are renowned for changing their mind... I think this is a great thing your wife has done... I just think, be careful and stay sensitive... cause how she feels today may not be how she feels tomorrow.

Blessings
Cat.