This is beginning to get a little frustrating, so for some clarification:
This is Haruda Kudo. She was literally two years old when the FMA manga first came out. She is not Arakawa.
This is Park Romi. She is the voice actress for Edward Elric. She is not Arakawa.
This woman, while unnamed, is not actually Arakawa. From the information provided online she is likely to be a coworker or someone to represent Arakawa.
The woman in the center is the real Arakawa.
This is her, again.