Initially, I think it has to be said that the best way to answer this question is to ask someone who likes the book. In all honesty, any fan of this book would be able to give you a dissertation and then some on the topic. It's one of those questions that if you ask someone who likes the book, you'll get more than you would ever need on the topic.
Having said all of this and not being an extraordinary fan of the work, I would say that the most compelling evidence of Bella's love for Edward is that, at the end of the novel, she wishes to be a vampire, like Edward. This would be the ultimate proof of her love for Edward. Being a human, and Edward being a vampire, proves that there is a natural chasm or gulf between them. Due to her love for him, she wishes to bridge that gap and become like him. He refuses because he understands what such a request would entail (and, unknown to Edward, sets in motion the subsequent follow ups to the work). Another example of Bella's love for Edward is that she is not repulsed by him or repelled by him being "different." She realizes that he is different with his demeanor, at first, and then his supernatural ability to save her, and his general presence, which she later realizes is that of a vampire. However, she is not paralyzed by fear and distance from him. Rather, she is entranced with him and uses their differences as a form of mystique, causing her heart to become more entranced with him. The overriding theme of the novel is her love/ infatuation with him.
As I said, if you know a fan of this book or even if you surf the net for the various homages to the work, I think you would gain more insight into the question.
Well mainly she accepted a vampire as her husband and she wants to give up her human life just to spend the rest of eternity with him. She barely knew him for a year and fell in love with him...I'm not sure that's such a great idea.
Some examples of Bella's love for Edward would be her simply accepting him for he was and what he'll always be and not running away from him but towards him. Also Bella is very willing to give up her humanity to spend the rest of her life with Edward and she hasn't even known him for more than a year if that's not love then I don't know what it is haha.
she asks to make love with him
Well in Twilight it doesn't seem like they really know each other or love each other, but you can tell they have feelings for each other. Edward has known Bella and has tried to keep her safe, and once Bella knows that he cares for her she starts to become fond of him and once she found out he was a vampire she was not afraid to be with him. So I think Bella loved him as a vampire and also as himself.