Wedding gift help.

My sister is getting married on the 18th. I got married last October and she could not afford to get me a gift. I know she was going through hard times and honestly I could care less she did a lot being my maid of honor that was enough for me. Now she is insisting I do not give her a gift because she did not get me one I told her that that didn't matter to me. Normally I would just give anybody getting married money, but I feel as though she strongly doesn't want me to give her a gift I should maybe give her something a little more thoughtful that's not money and that is cheaper. I wanted to get them a personalized marriage Christian Bible but for some reason can't seem to find it anywhere. Does anybody have any ideas of something that would be nice but a little simple that way she doesn't feel funny about me giving her a gift