honestly... I think if She loves you the wouldnt be a "proof thing" I am woman, I know what I am talking about.. of course love hurts.. I have been there before, like many of us.... you re young, you have got whole life ahead of you... but..if you really want to give her something.. buy one simple flower. see her reaction. good luck honey!
IMO, If a girl loves you she will put up with whatever because she loves you! If she just wants stuff then your going to be one poor man Like ME!
If she's issuing you an ultimatum like that she's obviously not that keen on you anymore. If she still had real feelings for you she would be blinkered by them and wouldn't need to ask you to prove your love for her. Forget her and move on.
she need to understand one word "Trust" it's not about to show how much you love her but it's about you really love her or not. there is nothing can measure love. and come on, 9.5 months is nothing. you still can find many more new one till you are about 40 years old. so take your time.
Ok I'll bite. Is there a reason she doesn't trust you or believe you love her ? Did you screw around ? Commit some other sort of virtually unforgivable act ? If so, I say good luck !! Nothing but time and proving yourself over and over again will fix that muckup. If not, and she's just generally insecure, I say kick her to the curb and move on. There is someone out there who will not demand "proof" of your love just for shits and giggles.