I am sincerely sorry for our loss. And hers. I'm sure you are both full of emotion over this. This sounds very recent as in just a couple of days ago. That means it is very fresh. Take a breather and let the dust settle. Hold each other and grieve your loss.
The implications of losing a tube are there to cause some fertility difficulties but not impossibility. One tube gone, one tube left means that when she ovulates from the other side of where the ectopic happened, she will be alright. Tubal pregnancies are not prone to recurring. The incidence rate is 10 to 15 percent max of a reoccurrence of that which you should take to mean highly unlikely that it will happen again. It may take her a little longer to get pregnant with one tube but is most definitely possible with one tube. And remember, there are always other options like IVF but would not think that you need to think of going down that route at all at this point.
Again, so sorry for your loss. My guess is she will want to try again down the road.
A lot depends on how recently this loss has been. If it just happened, she might feel you are rushing to solutions instead of accepting that it takes time to grieve. I think that is a guy thing, tossing out solutions and bracing advice is a way of dealing with sadness. But women really do need to have their time to be sad about things that are sad. You've got to accept that it will take her a while to let go of the dreams her first pregnancy brought her, and support her as she heals from the trauma. Healing from trauma does not mean rushing to try again.
If it has been months and she is still resisting your counsel, there are different ways to deal with this depending on what she is resisting. If the problem that she always wants to be on birth control and you would like to try for children again, I would suggest that in her own time, her desire for kids will rekindle and she will be willing to listen to the doctor's advice.
If the problem is that she is afraid of the loss of her other tube, again, time and her doctor (and any number of women who have gotten pregnant with only one tube) will have to be what reassures her. One ectopic does not lead to another. She does have about as good a chance with one tube as with two.
If the problem is that she is afraid to have sex at all because she is afraid to go through that pain and possibly lose the other tube, then you have to tread lightly. Again, if the loss was super recent, it's easy to see why she would feel that way. I would be super careful not to give the impression that the only reason you are reassuring her is that you want her to hurry up and have sex again. But if it has been a while and she is still saying no to sex because of the loss, you might have to look for other reasons in the relationship that she feels this way. I hope that's not it, but consider with an open mind. Maybe she just feels rushed, and like her grief is unheard. Maybe she just is done with sex for a while, and if that is so, you two should be talking. Not you advising her, just you asking her, and staying open to hear what she is telling you.