I adopted a cat and she hates me.

My boyfriend and I adopted a cat a little over a month ago. Shes a year old and We were told she was a very sweet girl but that it would take her time to adjust. Well we've given her time and have secluded her to just one room in the house so that she can get use to her surroundings. Nothing has helped she still will run away, his, or scratch us. Idk what to do and I refuse to bring her back to the animal shelter because I'm afraid she'll go to an abusive home.my boyfriend and I gave been thinking about getting a kitten so that she has some company other than us. The shelter didn't tell me anything about how she is with other caylts but on her paperwork it said she doesn't do well with other cats or dogs. But she was only at the shelter for a week before we adopted her so I feel like they didn't have much time to have her interact with the other cats. Should we get another cat and see how she is with The cat? The kitten we're getting will end up going to a shelter if we DONT take it in and I hate seeing pets gonto shelters. Idk what to do. I just want my little fur baby to he happy.