Balancing The Budget ALONE

My partner won't be part of the budget process.  She insists that she wants no part of it and I feel very alone when I have to make all the money decisions in the relationship.  I feel our entire financial future rests in my hands.  She might think she is trusting me but I feel she is burdening me.  Does anyone else have this problem and how can I get her to at least be part of this process since she brings in about 40% of our income?