can't say def as does not know how she will feel in 10 years time. But none of us can say what will happen in 10 years I suppose
Sorry, that sounds indecisive to me. I can definitely promise I will not feel positively toward the dubs in 10 or any number of years.
Maybe you can work with her to help her come to a decision. But it should not be because she wants to marry you--it should be because that's what's actually in her heart.
Not wanting to expose oneself to disconfirming information (COC) is a cult tactic. Ours taught that anyone who says anything bad about them is really controlled by Satan and they can be possessed by demons just by listening. Sounds like she's still afraid.