Dont try converting, it can ruin even a HEALTHY relationship.
Both of you just focus on Achieving Godly virtues that Gurbani Describes, im sure qoran describes that too... live a virtue-full life,
what benefit is there even if she Converts ? does Guru Benefits? NOOOOOOOO. Do you Benefit from that? probably NOOOOOO.
aFter all living a virtuous life is the True ESSENCE of SIKHI..... The Outer Dress Code doesnt matter at all.
you liked her because of her Qualities, Her Gunns ( Virtues), If those were AvGuns. As a Gurmukh SIkh, you wouldn't like her at the first place i'd suppose.
You liked her Virtues, i'd say Help her elevating her virtues even more. and forget about the Converting Ritual, ITS POINTLESS.