O.K., I'm back, and I found that passenger list again...it may not be her, but just check it out and see what you think.
Here's what I did:
Searched under "Immigration & Travel"
Typed in - 'Emma Herman'
Birth - '1892' Location - 'Germany'
Arrival - '1908' Location - 'New York'
Hit search, and she's about the 12th one on the list that shows up; arriving March 8, 1909. She's passenger 27 on the image. On that list it's spelled 'Herrmann'.
I hope their marriage certificate will help you get her parents names and her birthdate.