Girlfriends registration tags?

My girlfriend of a little over a year who I plan on marrying has overdue registration tags of over $600. I propose to her soon. She doesn't make me pay for everything but has been in a little financial pinch but does work and pays her own bills. Should I pay? I told her I'd pay.. she insisted on paying me back, $50 a week but I told her don't worry about it..

Girlfriends registration tags?
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