TBT is on the mark, spend whatever is necessary before the wedding, it will cost a lot less than what you have to spend to get a “get”. No one should have to be talked in to marriage. If the Kallah has serious doubts about the chassan then she should NOT be forced into the marriage. It is a disaster waiting to happen and she should speak ONLY to a qualified person to hear her out and help her out.
However, if she has nervous qualms about marriage or intimacy, she should also speak to a qualified person to hear her out and help her out, because that has nothing to do with a good guy. It has only to do with the fears of the unknown and inexperienced and she needs to have her questions answered by a sensitive and caring person.