You have only been married 4 months and she's not interested in sex? Why? Have you sat down with her to discuss your concerns, needs and asked her why and how this is not only effecting you, but will effect the relationship and marriage. Has she had a negative sexual experience in the past or lack of experience? Is she having health issues that are decreasing her desires? The only way you will know is by asking her what is the problem?
The foundation of a relationship is communication and trust and your needs not being fullfield need to be addressed. I also recommend that you speak with her first to discuss your concerns and needs and if that doesn't work then I recommend a marriage counselor, or offer to accompany her to a gynecologist if it's a health issued, but speak to her in a tone of concern for her well being and if there is anything that you can do to resolve or help her with any issue she might be having.
There is a difference between making love and having sex, something that is confused these days. It also starts in the morning, in case you did not know. Sex is different for men as opposed to women. Compliment her on her looks, her actions, make her feel appreciated by doing little things for her but dont be obvious that you want it to lead to sex. Do a load of laundry for her or get her breakfast for her and be genuine. A woman needs to feel like she is desired and appreciated outside of the bedroom before she reacts in the bedroom. Stay away from turnoffs like porn and vulgar talk about sex. Sex is usually about the relationship to a female, so if your not getting it in the bedroom you might want to reflect on things she has complained about? If this does not work, you need to have a down right open and honest conversation and take it from there. You dont give details so it is hard for an outsider to advise you other than the obvious.