A legitimate relationship or not you may want to find out how old your girlfriend actually is. "Maybe 60" will not cut it, I would suggest meeting at least two times before you even consider filing.
How long ago did you guys apply for an EAD, They changed this process a few years ago. I thought I didn't have one either I left the forms blank but then my lawyer told me to put the USCIS number on my EAD because that was the assigned A number which got when I received my EAD. Maybe they will give me a new one but I was told to include it anyway as my identity will be listed under that number and processing will be easier