Co-Workers Wedding

Hi, My friend/co-worker is getting married on Saturday, she has asked for gifts from her registry also monetary gifts, I am one of the bridesmaids,since my boyfriend and I both dont make a lot of money, should I give her money, if so how much since I am paying for the dress shoes, hotels, gas etc. Or something from her registry, if I do get something off reg. I dont think it will come in time, since the wedding is 3 days away. I know this is last minute, we have had financial problems come up. I have never been in a wedding before, I know this might sound kind of weird since I`m in the wedding, but we (the bride) are actually not that close. Thank you Tiffany