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I am sorry to hear about your baby, just must be so upset with yourself - but are you sure it is genital herpes or HSVII? It may very well be HSVI, and this is actually something that 80% of Americans have by age 18. It tends to occur when we are quite young, so we may not recall it. As long as she has no history of immune problems, it will heal.
You can take her to her pediatrician, and if it looks like a more intense outbreak than typical anti-viral medication can be given.
It may not even have been from you that she caught this!
Here is information on Herpes I:
Please write back if you have questions or need clarification so that we can assist you until you are satisfied with your answer.
Did you have HSVII or genital herpes in your mouth? This may be HSV I.
Either way, whether genital or oral the break out's become less and less as one ages.
Make sure she is getting well rounded nutrition (which likely you are providing) and is stressed as little as possible.
You should find this link helpful from the Miami Children's hospital. It provides some trusted alternative suggestions to help heal the rash: