I don't think you should "fake" anything, but you should keep it to yourself and learn to control your reactions. She knows that sex is important to you, no need to further point that out right now. Instead, turn your focus to what you can do for her. Ask, point blank, what shed like from you. Do not even mention your needs, especially for sex! Focus only on her.
Look, it may be a hormonal issue, a psychological issue or something else outside of you that may be the cause of her low desire. I had a friend that broke off his engagement to a young fiancée because she would only have sex every six months or so. She was desperately in love with him, but he had to break things off because he knew that he needed sex frequently and their marriage would never survive. He gave her every chance, but she would always find a way to get out of having sex. I hope that's not the case for you, but it might be.
As far as the time it takes to recover from a love bank deficit due to poor behavior? That depends on the situation, but my wife's sexual love didn't return for 6 months.
