searching for birth family, female 8/29/61 san francisco

My mother was placed for adoption at birth. I had tried a prior search but I gave up. I'm ready to start again. The information I received before may or may not be true. My mother may have been born Rebecca Bjorklund on 8/29/61. BMother may have been Joan Christen/Christenson. In my prior search I was told that she was deceased, but all information is unreliable. I know for a fact that my mother had older siblings at the time of her birth. I would be interested in contacting ANY family. We live in MT but she was born in CA. WARNING: I have no money. Any potential scam would be wasted on me.