Bismihi ta'ala

If you wish to marry someone, and you know they have experienced an unfortunate traumatic event, then you must be equipped with dealing with whatever situation or issue that arises. 

It would not be fair for you, or for her, that you are deprived of your sexual needs, and also unfair that you have some kind of "trial" with her before committing to marriage. 

If your question is a fiqhi question, should you and her meet the requirements of having a legitimate temporary marriage contract, then it would be valid for you to do so, but it would not solve the main issue for the future. 

Most important is understanding how to deal and interact with someone who has gone through a trauma and how it could affect the marital relationship, and whether or not both of you are able to handle it. 

This young lady you want to marry deserves to be treated right and fair, and not pressured into anything, and her situation must be observed. God forbid, you do not want to aggravate her trauma or make her issues worse. 

I would advice seeking guidance in getting professional counselling, for both of you, prior to making any decision, as long as you are genuine in wanting to marry her and will patiently assist her, not further harming her or making her life any more difficult. 

With prayers for your success