Relax. All is well. You and your partner need take no precautions to prevent HSV transmission. There is no need to restrict your sexual practices in any way.
Once someone has HSV of either type, s/he is immune (or at least highly resistant) to a new infection with the same type, anywhere on the body. That is especially true when both members of a couple are infected with the same strain of HSV -- which certainly is the case if it is true that your partner's genital herpes came from your oral infection. To the specific questions:
1) No. Genital herpes due to HSV-1 usually has fewer outbreaks and less asymptomatic viral shedding than HSV-2. See the thread whose link I provide below.
2) Your partner probably has a low potential for transmission of her genital HSV-1 to anybody. There is no chance she can give it back to you.
3,4) Yes to both questions.
5) No transmission risk. See above.
6) Estrogen has no known effect on frequency of HSV outbreaks. With genital HSV-1, your girlfriend probably will have few or no future outbreaks. See the link.
7) I do not expect herpes to be curable in the foreseeable future.
Here is the link you should read, which goes to a lot of detail about genital HSVB-1 infections: http://www.medhelp.org/posts/STDs/Recently-diagnosed-with-Genital-Herpes-HSV1/show/969931
Good luck-- HHH, MD