There are a couple things here that are huge red flags and I think that you should reconsider. First you stated that your wife has no working knowledge or training with firearms. Second you stated that you are trying to "Talk her into it" and finally you have shown that both of you need to do a lot of research about the laws and the real implications of the decision for her to own a gun. I am not trying to be hostile here, but you are putting them in a bad position by trying to convince her to do something that she either is not comfortable with or does not want to do.

If you are still even remotely considering getting, or having her get a gun, stop. She needs to want it, and more importantly she needs to want the training first. I know that you have your daughters best interest in mind, but having her mother own a gun does not help that situation in the slightest. She needs to be trained to defend herself and your daughter using as many means as possible, a firearm being just one of them. Use her recent experience to motivate her to seek training and pay for that. It will help her realize and identify danger and stay away from it as opposed to preparing her to shoot her way out of it. Pay for her to get the training and she will find the means that suit her best, and that is the best that you can hope for. Effective use of pressure points and a less than lethal weapon (tazer or mace) is better than an uneducated or untrained person wielding any gun. Plus if she does seek firearm training she will be educated about the laws as they apply to her and will have a better idea about what to get than you do, unless you actively seek out all of the information regarding firearm ownership in her county.